Merge from trunk

[emacs.git] / configure.in

dnl  Autoconf script for GNU Emacs
dnl To rebuild the `configure' script from this, execute the command
dnl     autoconf
dnl in the directory containing this script.
dnl If you changed any AC_DEFINES, also run autoheader.
dnl
dnl  Copyright (C) 1994, 1995, 1996, 1999, 2000, 2001, 2002, 2003, 2004,
dnl    2005, 2006, 2007, 2008, 2009, 2010
dnl    Free Software Foundation, Inc.
dnl
dnl  This file is part of GNU Emacs.
dnl
dnl  GNU Emacs is free software: you can redistribute it and/or modify
dnl  it under the terms of the GNU General Public License as published by
dnl  the Free Software Foundation, either version 3 of the License, or
dnl  (at your option) any later version.
dnl
dnl  GNU Emacs is distributed in the hope that it will be useful,
dnl  but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
dnl  GNU General Public License for more details.
dnl
dnl  You should have received a copy of the GNU General Public License
dnl  along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

AC_PREREQ(2.65)
AC_INIT(emacs, 24.0.50)
AC_CONFIG_HEADER(src/config.h:src/config.in)
AC_CONFIG_SRCDIR(src/lisp.h)

dnl Support for --program-prefix, --program-suffix and
dnl --program-transform-name options
AC_ARG_PROGRAM

dnl It is important that variables on the RHS not be expanded here,
dnl hence the single quotes.  This is per the GNU coding standards, see
dnl (autoconf) Installation Directory Variables
dnl See also epaths.h below.
lispdir='${datadir}/emacs/${version}/lisp'
locallisppath='${datadir}/emacs/${version}/site-lisp:'\
'${datadir}/emacs/site-lisp'
lisppath='${locallisppath}:${lispdir}:${datadir}/emacs/${version}/leim'
etcdir='${datadir}/emacs/${version}/etc'
archlibdir='${libexecdir}/emacs/${version}/${configuration}'
docdir='${datadir}/emacs/${version}/etc'
gamedir='${localstatedir}/games/emacs'

gameuser=games

dnl OPTION_DEFAULT_OFF(NAME, HELP-STRING)
dnl Create a new --with option that defaults to being disabled.
dnl NAME is the base name of the option.  The shell variable with_NAME
dnl   will be set to either the user's value (if the option is
dnl   specified; 'yes' for a plain --with-NAME) or to 'no' (if the
dnl   option is not specified).  Note that the shell variable name is
dnl   constructed as autoconf does, by replacing non-alphanumeric
dnl   characters with "_".
dnl HELP-STRING is the help text for the option.
AC_DEFUN([OPTION_DEFAULT_OFF], [dnl
  AC_ARG_WITH([$1],[AS_HELP_STRING([--with-$1],[$2])],[],[dnl
    m4_bpatsubst([with_$1], [[^0-9a-z]], [_])=no])dnl
])dnl

dnl OPTION_DEFAULT_ON(NAME, HELP-STRING)
dnl Create a new --with option that defaults to being enabled.  NAME
dnl   is the base name of the option.  The shell variable with_NAME
dnl   will be set either to 'no' (for a plain --without-NAME) or to
dnl   'yes' (if the option is not specified).  Note that the shell
dnl   variable name is constructed as autoconf does, by replacing
dnl   non-alphanumeric characters with "_".
dnl HELP-STRING is the help text for the option.
AC_DEFUN([OPTION_DEFAULT_ON], [dnl
  AC_ARG_WITH([$1],[AS_HELP_STRING([--without-$1],[$2])],[],[dnl
   m4_bpatsubst([with_$1], [[^0-9a-z]], [_])=yes])dnl
])dnl

OPTION_DEFAULT_ON([pop],[don't support POP mail retrieval with movemail])
if test "$with_pop" = yes; then
   AC_DEFINE(MAIL_USE_POP)
fi
AH_TEMPLATE(MAIL_USE_POP, [Define to support POP mail retrieval.])dnl

OPTION_DEFAULT_OFF([kerberos],[support Kerberos-authenticated POP])
if test "$with_kerberos" != no; then
   AC_DEFINE(KERBEROS)
fi
AH_TEMPLATE(KERBEROS,
            [Define to support Kerberos-authenticated POP mail retrieval.])dnl

OPTION_DEFAULT_OFF([kerberos5],[support Kerberos version 5 authenticated POP])
if test "${with_kerberos5}" != no; then
  if test "${with_kerberos}" = no; then
    with_kerberos=yes
    AC_DEFINE(KERBEROS)
  fi
  AC_DEFINE(KERBEROS5, 1, [Define to use Kerberos 5 instead of Kerberos 4.])
fi

OPTION_DEFAULT_OFF([hesiod],[support Hesiod to get the POP server host])
dnl FIXME hesiod support may not be present, so it seems like an error
dnl to define, or at least use, this unconditionally.
if test "$with_hesiod" != no; then
  AC_DEFINE(HESIOD, 1, [Define to support using a Hesiod database to find the POP server.])
fi

OPTION_DEFAULT_OFF([mmdf],[support MMDF mailboxes])
if test "$with_mmdf" != no; then
   AC_DEFINE(MAIL_USE_MMDF, 1, [Define to support MMDF mailboxes in movemail.])
fi

OPTION_DEFAULT_OFF([mail-unlink],[unlink, rather than empty, mail spool after reading])
if test "$with_mail_unlink" != no; then
   AC_DEFINE(MAIL_UNLINK_SPOOL, 1, [Define to unlink, rather than empty, mail spool after reading.])
fi

AC_ARG_WITH([mailhost],[AS_HELP_STRING([--with-mailhost=HOSTNAME],
    [string giving default POP mail host])],
    AC_DEFINE_UNQUOTED(MAILHOST, ["$withval"], [String giving fallback POP mail host.]))

OPTION_DEFAULT_ON([sound],[don't compile with sound support])

OPTION_DEFAULT_ON([sync-input],[process async input synchronously])
if test "$with_sync_input" = yes; then
   AC_DEFINE(SYNC_INPUT, 1, [Process async input synchronously.])
fi

dnl FIXME currently it is not the last.
dnl This should be the last --with option, because --with-x is
dnl added later on when we find the path of X, and it's best to
dnl keep them together visually.
AC_ARG_WITH([x-toolkit],[AS_HELP_STRING([--with-x-toolkit=KIT],
 [use an X toolkit (KIT one of: yes or gtk, gtk3, lucid or athena, motif, no)])],
[         case "${withval}" in
            y | ye | yes )      val=gtk ;;
            n | no )            val=no  ;;
            l | lu | luc | luci | lucid )       val=lucid ;;
            a | at | ath | athe | athen | athena )      val=athena ;;
            m | mo | mot | moti | motif )       val=motif ;;
            g | gt | gtk  )     val=gtk ;;
            gtk3  )     val=gtk3 ;;
            * )
AC_MSG_ERROR([`--with-x-toolkit=$withval' is invalid;
this option's value should be `yes', `no', `lucid', `athena', `motif', `gtk' or
`gtk3'.  `yes' and `gtk' are synonyms. `athena' and `lucid' are synonyms.])
            ;;
          esac
          with_x_toolkit=$val
])

dnl _ON results in a '--without' option in the --help output, so
dnl the help text should refer to "don't compile", etc.
OPTION_DEFAULT_ON([xpm],[don't compile with XPM image support])
OPTION_DEFAULT_ON([jpeg],[don't compile with JPEG image support])
OPTION_DEFAULT_ON([tiff],[don't compile with TIFF image support])
OPTION_DEFAULT_ON([gif],[don't compile with GIF image support])
OPTION_DEFAULT_ON([png],[don't compile with PNG image support])
OPTION_DEFAULT_ON([rsvg],[don't compile with SVG image support])
OPTION_DEFAULT_ON([xml2],[don't compile with XML parsing support])
OPTION_DEFAULT_ON([imagemagick],[don't compile with ImageMagick image support])

OPTION_DEFAULT_ON([xft],[don't use XFT for anti aliased fonts])
OPTION_DEFAULT_ON([libotf],[don't use libotf for OpenType font support])
OPTION_DEFAULT_ON([m17n-flt],[don't use m17n-flt for text shaping])

OPTION_DEFAULT_ON([toolkit-scroll-bars],[don't use Motif or Xaw3d scroll bars])
OPTION_DEFAULT_ON([xaw3d],[don't use Xaw3d])
OPTION_DEFAULT_ON([xim],[don't use X11 XIM])
OPTION_DEFAULT_OFF([ns],[use nextstep (Cocoa or GNUstep) windowing system])

OPTION_DEFAULT_ON([gpm],[don't use -lgpm for mouse support on a GNU/Linux console])
OPTION_DEFAULT_ON([dbus],[don't compile with D-Bus support])
OPTION_DEFAULT_ON([gconf],[don't compile with GConf support])
OPTION_DEFAULT_ON([selinux],[don't compile with SELinux support])
OPTION_DEFAULT_ON([gnutls],[don't use -lgnutls for SSL/TLS support])

## For the times when you want to build Emacs but don't have
## a suitable makeinfo, and can live without the manuals.
dnl http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg01844.html
OPTION_DEFAULT_ON([makeinfo],[don't require makeinfo for building manuals])

## This is an option because I do not know if all info/man support
## compressed files, nor how to test if they do so.
OPTION_DEFAULT_ON([compress-info],[don't compress the installed Info pages])
if test $with_compress_info = yes; then
   GZIP_INFO=yes
else
   GZIP_INFO=
fi
AC_SUBST(GZIP_INFO)

AC_ARG_WITH([pkg-config-prog],dnl
[AS_HELP_STRING([--with-pkg-config-prog=PATH],
                  [path to pkg-config for finding GTK and librsvg])])
if test "X${with_pkg_config_prog}" != X; then
   if test "${with_pkg_config_prog}" != yes; then
      PKG_CONFIG="${with_pkg_config_prog}"
   fi
fi

CRT_DIR=
AC_ARG_WITH([crt-dir],dnl
[AS_HELP_STRING([--with-crt-dir=DIR],[directory containing crtn.o etc.
The default is /usr/lib, or /usr/lib64 on some platforms.])])
CRT_DIR="${with_crt_dir}"

AC_ARG_WITH([gnustep-conf],dnl
[AS_HELP_STRING([--with-gnustep-conf=PATH],[path to GNUstep.conf; default $GNUSTEP_CONFIG_FILE, or /etc/GNUstep/GNUstep.conf])])
test "X${with_gnustep_conf}" != X && test "${with_gnustep_conf}" != yes && \
  GNUSTEP_CONFIG_FILE="${with_gnustep_conf}"
test "X$GNUSTEP_CONFIG_FILE" = "X" && \
     GNUSTEP_CONFIG_FILE=/etc/GNUstep/GNUstep.conf

AC_ARG_ENABLE(ns-self-contained,
[AS_HELP_STRING([--disable-ns-self-contained],
                [disable self contained build under NeXTstep])],
   EN_NS_SELF_CONTAINED=$enableval,
   EN_NS_SELF_CONTAINED=yes)

AC_ARG_ENABLE(asserts,
[AS_HELP_STRING([--enable-asserts], [compile code with asserts enabled])],
      USE_XASSERTS=$enableval,
      USE_XASSERTS=no)

AC_ARG_ENABLE(maintainer-mode,
[AS_HELP_STRING([--enable-maintainer-mode],
                [enable make rules and dependencies not useful (and sometimes
                 confusing) to the casual installer])],
      USE_MAINTAINER_MODE=$enableval,
      USE_MAINTAINER_MODE=no)
if test $USE_MAINTAINER_MODE = yes; then
  MAINT=
else
  MAINT=#
fi
AC_SUBST(MAINT)

AC_ARG_ENABLE(locallisppath,
[AS_HELP_STRING([--enable-locallisppath=PATH],
                [directories Emacs should search for lisp files specific
                 to this site])],
if test "${enableval}" = "no"; then
  locallisppath=
elif test "${enableval}" != "yes"; then
  locallisppath=${enableval}
fi)

AC_ARG_ENABLE(checking,
[AS_HELP_STRING([--enable-checking@<:@=LIST@:>@],
                [enable expensive run-time checks.  With LIST,
                 enable only specific categories of checks.
                 Categories are: all,yes,no.
                 Flags are: stringbytes, stringoverrun, stringfreelist,
                 xmallocoverrun, conslist])],
[ac_checking_flags="${enableval}"],[])
IFS="${IFS=     }"; ac_save_IFS="$IFS"; IFS="$IFS,"
for check in $ac_checking_flags
do
        case $check in
        # these set all the flags to specific states
        yes)            ac_enable_checking=1 ;;
        no)             ac_enable_checking= ;
                        ac_gc_check_stringbytes= ;
                        ac_gc_check_string_overrun= ;
                        ac_gc_check_string_free_list= ;
                        ac_xmalloc_overrun= ;
                        ac_gc_check_cons_list= ;;
        all)            ac_enable_checking=1 ;
                        ac_gc_check_stringbytes=1 ;
                        ac_gc_check_string_overrun=1 ;
                        ac_gc_check_string_free_list=1 ;
                        ac_xmalloc_overrun=1 ;
                        ac_gc_check_cons_list=1 ;;
        # these enable particular checks
        stringbytes)    ac_gc_check_stringbytes=1 ;;
        stringoverrun)  ac_gc_check_string_overrun=1 ;;
        stringfreelist) ac_gc_check_string_free_list=1 ;;
        xmallocoverrun) ac_xmalloc_overrun=1 ;;
        conslist)       ac_gc_check_cons_list=1 ;;
        *)      AC_MSG_ERROR(unknown check category $check) ;;
        esac
done
IFS="$ac_save_IFS"

if test x$ac_enable_checking != x ; then
  AC_DEFINE(ENABLE_CHECKING, 1,
[Enable expensive run-time checking of data types?])
fi
if test x$ac_gc_check_stringbytes != x ; then
  AC_DEFINE(GC_CHECK_STRING_BYTES, 1,
[Define this temporarily to hunt a bug.  If defined, the size of
   strings is redundantly recorded in sdata structures so that it can
   be compared to the sizes recorded in Lisp strings.])
fi
if test x$ac_gc_check_stringoverrun != x ; then
  AC_DEFINE(GC_CHECK_STRING_OVERRUN, 1,
[Define this to check for short string overrun.])
fi
if test x$ac_gc_check_string_free_list != x ; then
  AC_DEFINE(GC_CHECK_STRING_FREE_LIST, 1,
[Define this to check the string free list.])
fi
if test x$ac_xmalloc_overrun != x ; then
  AC_DEFINE(XMALLOC_OVERRUN_CHECK, 1,
[Define this to check for malloc buffer overrun.])
fi
if test x$ac_gc_check_cons_list != x ; then
  AC_DEFINE(GC_CHECK_CONS_LIST, 1,
[Define this to check for errors in cons list.])
fi

AC_ARG_ENABLE(use-lisp-union-type,
[AS_HELP_STRING([--enable-use-lisp-union-type],
                [use a union for the Lisp_Object data type.
                This is only useful for development for catching certain types of bugs.])],
if test "${enableval}" != "no"; then
   AC_DEFINE(USE_LISP_UNION_TYPE, 1,
   [Define this to use a lisp union for the Lisp_Object data type.])
fi)


AC_ARG_ENABLE(profiling,
[AS_HELP_STRING([--enable-profiling],
                [build emacs with profiling support.
                 This might not work on all platforms])],
[ac_enable_profiling="${enableval}"],[])
if test x$ac_enable_profiling != x ; then
   PROFILING_CFLAGS="-DPROFILING=1 -pg"
else
   PROFILING_CFLAGS=
fi
AC_SUBST(PROFILING_CFLAGS)

AC_ARG_ENABLE(autodepend,
[AS_HELP_STRING([--enable-autodepend],
                [automatically generate dependencies to .h-files.
                 Requires GNU Make and Gcc. Enabled if GNU Make and Gcc is
                 found])],
[ac_enable_autodepend="${enableval}"],[ac_enable_autodepend=yes])

#### Make srcdir absolute, if it isn't already.  It's important to
#### avoid running the path through pwd unnecessarily, since pwd can
#### give you automounter prefixes, which can go away.  We do all this
#### so Emacs can find its files when run uninstalled.
## Make sure CDPATH doesn't affect cd (in case PWD is relative).
unset CDPATH
case "${srcdir}" in
  /* ) ;;
  . )
    ## We may be able to use the $PWD environment variable to make this
    ## absolute.  But sometimes PWD is inaccurate.
    ## Note: we used to use ${PWD} at the end instead of `pwd`,
    ## but that tested only for a well-formed and valid PWD,
    ## it did not object when PWD was well-formed and valid but just wrong.
    if test ".${PWD}" != "." && test ".`(cd ${PWD} ; sh -c pwd)`" = ".`pwd`"  ;
    then
      srcdir="$PWD"
    else
      srcdir="`(cd ${srcdir}; pwd)`"
    fi
  ;;
  *  ) srcdir="`(cd ${srcdir}; pwd)`" ;;
esac

#### Check if the source directory already has a configured system in it.
if test `pwd` != `(cd ${srcdir} && pwd)` \
   && test -f "${srcdir}/src/config.h" ; then
  AC_MSG_WARN([[The directory tree `${srcdir}' is being used
   as a build directory right now; it has been configured in its own
   right.  To configure in another directory as well, you MUST
   use GNU make.  If you do not have GNU make, then you must
   now do `make distclean' in ${srcdir},
   and then run $0 again.]])
fi

#### Given the configuration name, set machfile and opsysfile to the
#### names of the m/*.h and s/*.h files we should use.

### Canonicalize the configuration name.

AC_CANONICAL_HOST
canonical=$host
configuration=${host_alias-${build_alias-$host}}

dnl This used to use changequote, but, apart from `changequote is evil'
dnl per the autoconf manual, we can speed up autoconf somewhat by quoting
dnl the great gob of text.  Thus it's not processed for possible expansion.
dnl Just make sure the brackets remain balanced.
dnl
dnl Since Emacs can't find matching pairs of quotes, boundaries are
dnl indicated by comments.
dnl quotation begins
[

### If you add support for a new configuration, add code to this
### switch statement to recognize your configuration name and select
### the appropriate operating system and machine description files.

### You would hope that you could choose an m/*.h file pretty much
### based on the machine portion of the configuration name, and an s/*.h
### file based on the operating system portion.  However, it turns out
### that each m/*.h file is pretty manufacturer-specific - for
### example mips.h is MIPS
### So we basically have to have a special case for each
### configuration name.
###
### As far as handling version numbers on operating systems is
### concerned, make sure things will fail in a fixable way.  If
### /etc/MACHINES doesn't say anything about version numbers, be
### prepared to handle anything reasonably.  If version numbers
### matter, be sure /etc/MACHINES says something about it.

machine='' opsys='' unported=no
case "${canonical}" in

  ## FreeBSD ports
  *-*-freebsd* )
    opsys=freebsd
    case "${canonical}" in
      alpha*)           machine=alpha ;;
      amd64-*|x86_64-*) machine=amdx86-64 ;;
      arm*)             machine=arm ;;
      ia64-*)           machine=ia64 ;;
      i[3456]86-*)      machine=intel386 ;;
      powerpc-*)        machine=macppc ;;
      sparc-*)          machine=sparc ;;
      sparc64-*)        machine=sparc ;;
    esac
  ;;

  ## FreeBSD kernel + glibc based userland
  *-*-kfreebsd*gnu* )
    opsys=gnu-kfreebsd
    case "${canonical}" in
      alpha*)           machine=alpha ;;
      amd64-*|x86_64-*) machine=amdx86-64 ;;
      ia64-*)           machine=ia64 ;;
      i[3456]86-*)      machine=intel386 ;;
      powerpc-*)        machine=macppc ;;
      sparc-*)          machine=sparc ;;
      sparc64-*)        machine=sparc ;;
    esac
  ;;

  ## NetBSD ports
  *-*-netbsd* )
    opsys=netbsd
    case "${canonical}" in
      alpha*)      machine=alpha ;;
      x86_64-*)    machine=amdx86-64 ;;
      arm-*)       machine=arm ;;
      hppa-*)      machine=hp800 ;;
      i[3456]86-*) machine=intel386 ;;
      m68k-*)      machine=m68k ;;
      powerpc-*)   machine=macppc ;;
      mips-*)      machine=mips ;;
      mipse[bl]-*) machine=mips ;;
      sparc*-)     machine=sparc ;;
      vax-*)       machine=vax ;;
    esac
  ;;

  ## OpenBSD ports
  *-*-openbsd* )
    opsys=openbsd
    case "${canonical}" in
      alpha*)    machine=alpha ;;
      x86_64-*)  machine=amdx86-64 ;;
      arm-*)     machine=arm ;;
      hppa-*)    machine=hp800 ;;
      i386-*)    machine=intel386 ;;
      powerpc-*) machine=macppc ;;
      sparc*)    machine=sparc ;;
      vax-*)     machine=vax ;;
    esac
  ;;

  alpha*-*-linux-gnu* )
    machine=alpha opsys=gnu-linux
  ;;

  arm*-*-linux-gnu* )
    machine=arm opsys=gnu-linux
  ;;

  ## Apple Darwin / Mac OS X
  *-apple-darwin* )
    case "${canonical}" in
      i[3456]86-* )  machine=intel386 ;;
      powerpc-* )    machine=macppc ;;
      x86_64-* )     machine=amdx86-64 ;;
      * )            unported=yes ;;
    esac
    opsys=darwin
    # Define CPP as follows to make autoconf work correctly.
    CPP="${CC-cc} -E -no-cpp-precomp"
    # Use fink packages if available.
    if test -d /sw/include && test -d /sw/lib; then
      GCC_TEST_OPTIONS="-I/sw/include -L/sw/lib"
      CPP="${CPP} ${GCC_TEST_OPTIONS}"
      NON_GCC_TEST_OPTIONS=${GCC_TEST_OPTIONS}
    fi
  ;;

  ## HP 9000 series 700 and 800, running HP/UX
  hppa*-hp-hpux10.2* )
    machine=hp800 opsys=hpux10-20
  ;;
  hppa*-hp-hpux1[1-9]* )
    machine=hp800 opsys=hpux11
    CFLAGS="-D_INCLUDE__STDC_A1_SOURCE $CFLAGS"
  ;;

  hppa*-*-linux-gnu* )
    machine=hp800 opsys=gnu-linux
  ;;

  ## IBM machines
  s390-*-linux-gnu* )
    machine=ibms390 opsys=gnu-linux
  ;;
  s390x-*-linux-gnu* )
    machine=ibms390x opsys=gnu-linux
  ;;
  rs6000-ibm-aix4.[23]* )
    machine=ibmrs6000 opsys=aix4-2
  ;;
  powerpc-ibm-aix4.[23]*  )
    machine=ibmrs6000 opsys=aix4-2
  ;;
  rs6000-ibm-aix[56]* )
    machine=ibmrs6000 opsys=aix4-2
  ;;
  powerpc-ibm-aix[56]*  )
    machine=ibmrs6000 opsys=aix4-2
  ;;

  ## Macintosh PowerPC
  powerpc*-*-linux-gnu* )
    machine=macppc opsys=gnu-linux
  ;;

  ## Silicon Graphics machines
  ## Iris 4D
  mips-sgi-irix6.5 )
    machine=iris4d opsys=irix6-5
    # Without defining _LANGUAGE_C, things get masked out in the headers
    # so that, for instance, grepping for `free' in stdlib.h fails and
    # AC_HEADER_STD_C fails.   (MIPSPro 7.2.1.2m compilers, Irix 6.5.3m).
    NON_GNU_CPP="/lib/cpp -D_LANGUAGE_C"
    NON_GCC_TEST_OPTIONS="-D_LANGUAGE_C"
  ;;

  ## Suns
  sparc-*-linux-gnu* | sparc64-*-linux-gnu* )
    machine=sparc opsys=gnu-linux
  ;;

  *-sun-solaris* \
    | i[3456]86-*-solaris2* | i[3456]86-*-sunos5* \
    | x86_64-*-solaris2*    | x86_64-*-sunos5*)
    case "${canonical}" in
      i[3456]86-*-* )     machine=intel386 ;;
      amd64-*-*|x86_64-*-*)     machine=amdx86-64 ;;
      sparc* )          machine=sparc ;;
      * )               unported=yes ;;
    esac
    case "${canonical}" in
      *-sunos5.6* | *-solaris2.6* )
                opsys=sol2-6
                NON_GNU_CPP=/usr/ccs/lib/cpp
                RANLIB="ar -ts"
                ;;
      *-sunos5.[7-9]* | *-solaris2.[7-9]* )
                opsys=sol2-6
                emacs_check_sunpro_c=yes
                NON_GNU_CPP=/usr/ccs/lib/cpp
                ;;
      *-sunos5* | *-solaris* )
                opsys=sol2-10
                emacs_check_sunpro_c=yes
                NON_GNU_CPP=/usr/ccs/lib/cpp
                ;;
    esac
    ## Watch out for a compiler that we know will not work.
    case "${canonical}" in
     *-solaris* | *-sunos5* )
                if [ "x$CC" = x/usr/ucb/cc ]; then
                  ## /usr/ucb/cc doesn't work;
                  ## we should find some other compiler that does work.
                  unset CC
                fi
                ;;
      *) ;;
    esac
  ;;

  ## IA-64
  ia64*-*-linux* )
    machine=ia64 opsys=gnu-linux
  ;;

  ## Intel 386 machines where we don't care about the manufacturer.
  i[3456]86-*-* )
    machine=intel386
    case "${canonical}" in
      *-cygwin )                opsys=cygwin ;;
      *-darwin* )               opsys=darwin
                                CPP="${CC-cc} -E -no-cpp-precomp"
                                ;;
      *-linux-gnu* )            opsys=gnu-linux ;;
      *-sysv4.2uw* )            opsys=unixware; NON_GNU_CPP=/lib/cpp ;;
      *-sysv5uw* )              opsys=unixware; NON_GNU_CPP=/lib/cpp ;;
      *-sysv5OpenUNIX* )        opsys=unixware; NON_GNU_CPP=/lib/cpp ;;
      ## Otherwise, we'll fall through to the generic opsys code at the bottom.
    esac
  ;;

  ## m68k Linux-based GNU system
  m68k-*-linux-gnu* )
    machine=m68k opsys=gnu-linux
  ;;

  ## Mips Linux-based GNU system
  mips-*-linux-gnu* | mipsel-*-linux-gnu* \
    | mips64-*-linux-gnu* | mips64el-*-linux-gnu* )
    machine=mips opsys=gnu-linux
  ;;

  ## AMD x86-64 Linux-based GNU system
  x86_64-*-linux-gnu* )
    machine=amdx86-64 opsys=gnu-linux
  ;;

  ## Tensilica Xtensa Linux-based GNU system
  xtensa*-*-linux-gnu* )
    machine=xtensa opsys=gnu-linux
    ;;

  ## SuperH Linux-based GNU system
  sh[34]*-*-linux-gnu* )
    machine=sh3 opsys=gnu-linux
  ;;

  * )
    unported=yes
  ;;
esac

### If the code above didn't choose an operating system, just choose
### an operating system based on the configuration name.  You really
### only want to use this when you have no idea what the right
### operating system is; if you know what operating systems a machine
### runs, it's cleaner to make it explicit in the case statement
### above.
if test x"${opsys}" = x; then
  case "${canonical}" in
    *-gnu* )                            opsys=gnu ;;
    * )
      unported=yes
    ;;
  esac
fi

]
dnl quotation ends

if test $unported = yes; then
  AC_MSG_ERROR([Emacs hasn't been ported to `${canonical}' systems.
Check `etc/MACHINES' for recognized configuration names.])
fi

machfile="m/${machine}.h"
opsysfile="s/${opsys}.h"


#### Choose a compiler.
test -n "$CC" && cc_specified=yes

# Save the value of CFLAGS that the user specified.
SPECIFIED_CFLAGS="$CFLAGS"

dnl Sets GCC=yes if using gcc.
AC_PROG_CC

# On Suns, sometimes $CPP names a directory.
if test -n "$CPP" && test -d "$CPP"; then
  CPP=
fi

## If not using gcc, and on Solaris, and no CPP specified, see if
## using a Sun compiler, which needs -Xs to prevent whitespace.
if test x"$GCC" != xyes && test x"$emacs_check_sunpro_c" = xyes && \
 test x"$CPP" = x; then
  AC_MSG_CHECKING([whether we are using a Sun C compiler])
  AC_CACHE_VAL(emacs_cv_sunpro_c,
  [AC_TRY_LINK([],
[#ifndef __SUNPRO_C
fail;
#endif
], emacs_cv_sunpro_c=yes, emacs_cv_sunpro_c=no)])
  AC_MSG_RESULT($emacs_cv_sunpro_c)

  if test x"$emacs_cv_sunpro_c" = xyes; then
    NON_GNU_CPP="$CC -E -Xs"
  fi
fi

#### Some systems specify a CPP to use unless we are using GCC.
#### Now that we know whether we are using GCC, we can decide whether
#### to use that one.
if test "x$NON_GNU_CPP" != x && test x$GCC != xyes && test "x$CPP" = x
then
  CPP="$NON_GNU_CPP"
fi

#### Some systems specify a CC to use unless we are using GCC.
#### Now that we know whether we are using GCC, we can decide whether
#### to use that one.
if test "x$NON_GNU_CC" != x && test x$GCC != xyes &&
  test x$cc_specified != xyes
then
  CC="$NON_GNU_CC"
fi

if test x$GCC = xyes; then
  test "x$GCC_TEST_OPTIONS" != x && CC="$CC $GCC_TEST_OPTIONS"
else
  test "x$NON_GCC_TEST_OPTIONS" != x && CC="$CC $NON_GCC_TEST_OPTIONS"
fi

dnl checks for Unix variants
AC_USE_SYSTEM_EXTENSIONS

### Use -Wno-pointer-sign if the compiler supports it
AC_MSG_CHECKING([whether gcc understands -Wno-pointer-sign])
SAVE_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Wno-pointer-sign"
AC_TRY_COMPILE([], [], has_option=yes, has_option=no,)
if test $has_option = yes; then
   C_WARNINGS_SWITCH="-Wno-pointer-sign $C_WARNINGS_SWITCH"
fi
AC_MSG_RESULT($has_option)
CFLAGS="$SAVE_CFLAGS"
unset has_option
unset SAVE_CFLAGS

### Use -Wdeclaration-after-statement if the compiler supports it
AC_MSG_CHECKING([whether gcc understands -Wdeclaration-after-statement])
SAVE_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Wdeclaration-after-statement"
AC_TRY_COMPILE([], [], has_option=yes, has_option=no,)
if test $has_option = yes; then
   C_WARNINGS_SWITCH="-Wdeclaration-after-statement $C_WARNINGS_SWITCH"
fi
AC_MSG_RESULT($has_option)
CFLAGS="$SAVE_CFLAGS"
unset has_option
unset SAVE_CFLAGS

### Use -Wold-style-definition if the compiler supports it
# This can be removed when conversion to standard C is finished.
AC_MSG_CHECKING([whether gcc understands -Wold-style-definition])
SAVE_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Wold-style-definition"
AC_TRY_COMPILE([], [], has_option=yes, has_option=no,)
if test $has_option = yes; then
   C_WARNINGS_SWITCH="-Wold-style-definition $C_WARNINGS_SWITCH"
fi
AC_MSG_RESULT($has_option)
CFLAGS="$SAVE_CFLAGS"
unset has_option
unset SAVE_CFLAGS

### Use -Wimplicit-function-declaration if the compiler supports it
AC_MSG_CHECKING([whether gcc understands -Wimplicit-function-declaration])
SAVE_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Wimplicit-function-declaration"
AC_TRY_COMPILE([], [], has_option=yes, has_option=no,)
if test $has_option = yes; then
   C_WARNINGS_SWITCH="-Wimplicit-function-declaration $C_WARNINGS_SWITCH"
fi
AC_MSG_RESULT($has_option)
CFLAGS="$SAVE_CFLAGS"
unset has_option
unset SAVE_CFLAGS

AC_SUBST(C_WARNINGS_SWITCH)


#### Some other nice autoconf tests.

dnl checks for programs
AC_PROG_CPP
AC_PROG_INSTALL
if test "x$RANLIB" = x; then
  AC_PROG_RANLIB
fi

## Although we're running on an amd64 kernel, we're actually compiling for
## the x86 architecture.  The user should probably have provided an
## explicit --build to `configure', but if everything else than the kernel
## is running in i386 mode, we can help them out.
if test "$machine" = "amdx86-64"; then
  AC_CHECK_DECL([i386])
  if test "$ac_cv_have_decl_i386" = "yes"; then
    canonical=`echo "$canonical" | sed -e 's/^amd64/i386/' -e 's/^x86_64/i386/'`
    machine=intel386
    machfile="m/${machine}.h"
  fi
fi

AC_PATH_PROG(INSTALL_INFO, install-info)
AC_PATH_PROG(INSTALL_INFO, install-info,, /usr/sbin)
AC_PATH_PROG(INSTALL_INFO, install-info,:, /sbin)
dnl Don't use GZIP, which is used by gzip for additional parameters.
AC_PATH_PROG(GZIP_PROG, gzip)


## Need makeinfo >= 4.6 (?) to build the manuals.
AC_PATH_PROG(MAKEINFO, makeinfo, no)
dnl By this stage, configure has already checked for egrep and set EGREP,
dnl or exited with an error if no egrep was found.
if test "$MAKEINFO" != "no" && \
  test x"`$MAKEINFO --version 2> /dev/null | $EGREP 'texinfo[[^0-9]]*([[1-4]][[0-9]]+|[[5-9]]|4\.[[6-9]]|4\.[[1-5]][[0-9]]+)'`" = x; then
   MAKEINFO=no
fi

## Makeinfo is unusual.  For a released Emacs, the manuals are
## pre-built, and not deleted by the normal clean rules.  makeinfo is
## therefore in the category of "special tools" not normally required, which
## configure does not have to check for (eg autoconf itself).
## In a Bazaar checkout on the other hand, the manuals are not included.
## So makeinfo is a requirement to build from Bazaar, and configure
## should test for it as it does for any other build requirement.
## We use the presence of $srcdir/info/emacs to distinguish a release,
## with pre-built manuals, from a Bazaar checkout.
if test "$MAKEINFO" = "no"; then
  if test "x${with_makeinfo}" = "xno"; then
    MAKEINFO=off
  elif test ! -e $srcdir/info/emacs; then
    AC_MSG_ERROR( [You do not seem to have makeinfo >= 4.6, and your
source tree does not seem to have pre-built manuals in the `info' directory.
Either install a suitable version of makeinfo, or re-run configure
with the `--without-makeinfo' option to build without the manuals.] )
  fi
fi

dnl Add our options to ac_link now, after it is set up.

if test x$GCC = xyes; then
  test "x$GCC_LINK_TEST_OPTIONS" != x && \
    ac_link="$ac_link $GCC_LINK_TEST_OPTIONS"
else
  test "x$NON_GCC_LINK_TEST_OPTIONS" != x && \
    ac_link="$ac_link $NON_GCC_LINK_TEST_OPTIONS"
fi

dnl We need -znocombreloc if we're using a relatively recent GNU ld.
dnl If we can link with the flag, it shouldn't do any harm anyhow.
dnl (Don't use `-z nocombreloc' as -z takes no arg on Irix.)
dnl Treat GCC specially since it just gives a non-fatal `unrecognized option'
dnl if not built to support GNU ld.

late_LDFLAGS=$LDFLAGS
if test x$GCC = xyes; then
  LDFLAGS="$LDFLAGS -Wl,-znocombreloc"
else
  LDFLAGS="$LDFLAGS -znocombreloc"
fi

AC_MSG_CHECKING([for -znocombreloc])
AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
  [AC_MSG_RESULT(yes)],
  LDFLAGS=$late_LDFLAGS
  [AC_MSG_RESULT(no)])


# The value of CPP is a quoted variable reference, so we need to do this
# to get its actual value...
CPP=`eval "echo $CPP"`


dnl Not used by any currently supported platform.
dnl The function dump-emacs will not be defined and temacs will do
dnl (load "loadup") automatically unless told otherwise.
CANNOT_DUMP=no
case "$opsys" in
  your-opsys-here)
   CANNOT_DUMP=yes
   AC_DEFINE(CANNOT_DUMP, 1, [Define if Emacs cannot be dumped on your system.])
  ;;
esac
AC_SUBST(CANNOT_DUMP)


UNEXEC_OBJ=unexelf.o
case "$opsys" in
  # MSDOS uses unexcoff.o
  # MSWindows uses unexw32.o
  aix4-2)
   UNEXEC_OBJ=unexaix.o
   ;;
  cygwin)
   UNEXEC_OBJ=unexcw.o
   ;;
  darwin)
   UNEXEC_OBJ=unexmacosx.o
   ;;
  hpux10-20 | hpux11)
   UNEXEC_OBJ=unexhp9k800.o
   ;;
  sol2-10)
   # Use the Solaris dldump() function, called from unexsol.c, to dump
   # emacs, instead of the generic ELF dump code found in unexelf.c.
   # The resulting binary has a complete symbol table, and is better
   # for debugging and other observability tools (debuggers, pstack, etc).
   # 
   # If you encounter a problem using dldump(), please consider sending
   # a message to the OpenSolaris tools-linking mailing list:
   #      http://mail.opensolaris.org/mailman/listinfo/tools-linking
   # 
   # It is likely that dldump() works with older Solaris too, but this has
   # not been tested, so for now this change is for Solaris 10 or newer.
   UNEXEC_OBJ=unexsol.o
   ;;
esac

LD_SWITCH_SYSTEM=
case "$opsys" in
  freebsd)
   ## Let `ld' find image libs and similar things in /usr/local/lib.
   ## The system compiler, GCC, has apparently been modified to not
   ## look there, contrary to what a stock GCC would do.
   LD_SWITCH_SYSTEM=-L/usr/local/lib
   ;;

  gnu-linux)
   ## cpp test was "ifdef __mips__", but presumably this is equivalent...
   test "$machine" = "mips" && LD_SWITCH_SYSTEM="-G 0"
   ;;

  netbsd)
   LD_SWITCH_SYSTEM="-Wl,-rpath,/usr/pkg/lib -L/usr/pkg/lib -Wl,-rpath,/usr/local/lib -L/usr/local/lib"
   ;;

  openbsd)
   ## Han Boetes <han@mijncomputer.nl> says this is necessary,
   ## otherwise Emacs dumps core on elf systems.
   LD_SWITCH_SYSTEM="-Z"
   ;;
esac
AC_SUBST(LD_SWITCH_SYSTEM)

ac_link="$ac_link $LD_SWITCH_SYSTEM"

## This setting of LD_SWITCH_SYSTEM references LD_SWITCH_X_SITE_AUX,
## which has not been defined yet.  When this was handled with cpp,
## it was expanded to null when configure sourced the s/*.h file.
## Thus LD_SWITCH_SYSTEM had different values in configure and the Makefiles.
## FIXME it would be cleaner to put this in LD_SWITCH_SYSTEM_TEMACS
## (or somesuch), but because it is supposed to go at the _front_
## of LD_SWITCH_SYSTEM, we cannot do that in exactly the same way.
## Compare with the gnu-linux case below, which added to the end
## of LD_SWITCH_SYSTEM, and so can instead go at the front of
## LD_SWITCH_SYSTEM_TEMACS.
case "$opsys" in
  netbsd|openbsd)
   ## _AUX_RPATH is like _AUX, but uses -rpath instead of -R.
   LD_SWITCH_SYSTEM="\$(LD_SWITCH_X_SITE_AUX_RPATH) $LD_SWITCH_SYSTEM" ;;
esac


C_SWITCH_MACHINE=
if test "$machine" = "alpha"; then
  AC_CHECK_DECL([__ELF__])
  if test "$ac_cv_have_decl___ELF__" = "yes"; then
    ## With ELF, make sure that all common symbols get allocated to in the
    ## data section.  Otherwise, the dump of temacs may miss variables in
    ## the shared library that have been initialized.  For example, with
    ## GNU libc, __malloc_initialized would normally be resolved to the
    ## shared library's .bss section, which is fatal.
    if test "x$GCC" = "xyes"; then
      C_SWITCH_MACHINE="-fno-common"
    else
      AC_MSG_ERROR([What gives?  Fix me if DEC Unix supports ELF now.])
    fi
  else
    UNEXEC_OBJ=unexalpha.o 
  fi
fi
AC_SUBST(C_SWITCH_MACHINE)

AC_SUBST(UNEXEC_OBJ)

C_SWITCH_SYSTEM=
## Some programs in src produce warnings saying certain subprograms
## are too complex and need a MAXMEM value greater than 2000 for
## additional optimization.  --nils@exp-math.uni-essen.de
test "$opsys" = "aix4.2" && test "x$GCC" != "xyes" && \
  C_SWITCH_SYSTEM="-ma -qmaxmem=4000"
## gnu-linux might need -D_BSD_SOURCE on old libc5 systems.
## It is redundant in glibc2, since we define _GNU_SOURCE.
AC_SUBST(C_SWITCH_SYSTEM)


LIBS_SYSTEM=
case "$opsys" in
  ## IBM's X11R5 uses -lIM and -liconv in AIX 3.2.2.
  aix4-2) LIBS_SYSTEM="-lrts -lIM -liconv" ;;

  freebsd) LIBS_SYSTEM="-lutil" ;;

  hpux*) LIBS_SYSTEM="-l:libdld.sl" ;;

  sol2*) LIBS_SYSTEM="-lsocket -lnsl -lkstat" ;;

  ## Motif needs -lgen.
  unixware) LIBS_SYSTEM="-lsocket -lnsl -lelf -lgen" ;;
esac
AC_SUBST(LIBS_SYSTEM)


### Make sure subsequent tests use flags consistent with the build flags.

if test x"${OVERRIDE_CPPFLAGS}" != x; then
  CPPFLAGS="${OVERRIDE_CPPFLAGS}"
else
  CPPFLAGS="$C_SWITCH_SYSTEM $C_SWITCH_MACHINE $CPPFLAGS"
fi

dnl For AC_FUNC_GETLOADAVG, at least:
AC_CONFIG_LIBOBJ_DIR(src)

dnl Do this early because it can frob feature test macros for Unix-98 &c.
AC_SYS_LARGEFILE


## If user specified a crt-dir, use that unconditionally.
if test "X$CRT_DIR" = "X"; then

  case "$canonical" in
    x86_64-*-linux-gnu* | s390x-*-linux-gnu*)
    ## On x86-64 and s390x GNU/Linux distributions, the standard library
    ## can be in a variety of places.  We only try /usr/lib64 and /usr/lib.
    ## For anything else (eg /usr/lib32), it is up the user to specify
    ## the location (bug#5655).
    ## Test for crtn.o, not just the directory, because sometimes the
    ## directory exists but does not have the relevant files (bug#1287).
    ## FIXME better to test for binary compatibility somehow.
    test -e /usr/lib64/crtn.o && CRT_DIR=/usr/lib64
    ;;

    powerpc64-*-linux-gnu* | sparc64-*-linux-gnu*) CRT_DIR=/usr/lib64 ;;
  esac

  case "$opsys" in
    hpux10-20) CRT_DIR=/lib ;;
  esac

  ## Default is /usr/lib.
  test "X$CRT_DIR" = "X" && CRT_DIR=/usr/lib

else

  ## Some platforms don't use any of these files, so it is not
  ## appropriate to put this test outside the if block.
  test -e $CRT_DIR/crtn.o || test -e $CRT_DIR/crt0.o || \
    AC_MSG_ERROR([crt*.o not found in specified location.])

fi

AC_SUBST(CRT_DIR)

LIB_MATH=-lm
LIB_STANDARD=
START_FILES=

case $opsys in
  cygwin )
    LIB_MATH=
    START_FILES='pre-crt0.o'
    ;;
  darwin )
    ## Adding -lm confuses the dynamic linker, so omit it.
    LIB_MATH=
    START_FILES='pre-crt0.o'
    ;;
  freebsd )
    LIB_STANDARD='-lgcc -lc -lgcc $(CRT_DIR)/crtend.o $(CRT_DIR)/crtn.o'
    START_FILES='pre-crt0.o $(CRT_DIR)/crt1.o $(CRT_DIR)/crti.o $(CRT_DIR)/crtbegin.o'
    ;;
  gnu-linux | gnu-kfreebsd )
    LIB_STANDARD='-lgcc -lc -lgcc $(CRT_DIR)/crtn.o'
    START_FILES='pre-crt0.o $(CRT_DIR)/crt1.o $(CRT_DIR)/crti.o'
    ;;
  hpux10-20 | hpux11 )
    LIB_STANDARD=-lc
    START_FILES='pre-crt0.o $(CRT_DIR)/crt0.o'
    ;;
  netbsd | openbsd )
    if test -f $CRT_DIR/crti.o; then
        LIB_STANDARD='-lgcc -lc -lgcc $(CRT_DIR)/crtend.o $(CRT_DIR)/crtn.o'
        START_FILES='pre-crt0.o $(CRT_DIR)/crt0.o $(CRT_DIR)/crti.o $(CRT_DIR)/crtbegin.o'
    else
        LIB_STANDARD='-lgcc -lc -lgcc $(CRT_DIR)/crtend.o'
        START_FILES='pre-crt0.o $(CRT_DIR)/crt0.o $(CRT_DIR)/crtbegin.o'
    fi
    ;;
esac

AC_SUBST(LIB_MATH)
AC_SUBST(START_FILES)

dnl This function definition taken from Gnome 2.0
dnl PKG_CHECK_MODULES(GSTUFF, gtk+-2.0 >= 1.3 glib = 1.3.4, action-if, action-not)
dnl defines GSTUFF_LIBS, GSTUFF_CFLAGS, see pkg-config man page
dnl also defines GSTUFF_PKG_ERRORS on error
AC_DEFUN([PKG_CHECK_MODULES], [
  succeeded=no

  AC_PATH_PROG(PKG_CONFIG, pkg-config, no)

  if test "$PKG_CONFIG" = "no" ; then
     ifelse([$4], , [AC_MSG_ERROR([
      *** The pkg-config script could not be found. Make sure it is in your path, or give the full path to pkg-config with the PKG_CONFIG environment variable or --with-pkg-config-prog.  Or see http://www.freedesktop.org/software/pkgconfig to get pkg-config.])], [$4])
  else
     PKG_CONFIG_MIN_VERSION=0.9.0
     if $PKG_CONFIG --atleast-pkgconfig-version $PKG_CONFIG_MIN_VERSION; then
        AC_MSG_CHECKING(for $2)

        if $PKG_CONFIG --exists "$2" 2>&AS_MESSAGE_LOG_FD; then
            AC_MSG_RESULT(yes)
            succeeded=yes

            AC_MSG_CHECKING($1_CFLAGS)
            $1_CFLAGS=`$PKG_CONFIG --cflags "$2"|sed -e 's,///*,/,g'`
            AC_MSG_RESULT($$1_CFLAGS)

            AC_MSG_CHECKING($1_LIBS)
            $1_LIBS=`$PKG_CONFIG --libs "$2"|sed -e 's,///*,/,g'`
            AC_MSG_RESULT($$1_LIBS)
        else
            AC_MSG_RESULT(no)
            $1_CFLAGS=""
            $1_LIBS=""
            ## If we have a custom action on failure, don't print errors, but
            ## do set a variable so people can do so.
            $1_PKG_ERRORS=`$PKG_CONFIG --errors-to-stdout --print-errors "$2"`
            ifelse([$4], ,echo $$1_PKG_ERRORS,)
        fi

        AC_SUBST($1_CFLAGS)
        AC_SUBST($1_LIBS)
     else
        echo "*** Your version of pkg-config is too old. You need version $PKG_CONFIG_MIN_VERSION or newer."
        echo "*** See http://www.freedesktop.org/software/pkgconfig"
     fi
  fi

  if test $succeeded = yes; then
     ifelse([$3], , :, [$3])
  else
     ifelse([$4], , [AC_MSG_ERROR([Library requirements ($2) not met; consider adjusting the PKG_CONFIG_PATH environment variable if your libraries are in a nonstandard prefix so pkg-config can find them.])], [$4])
  fi
])


if test "${with_sound}" != "no"; then
  # Sound support for GNU/Linux and the free BSDs.
  AC_CHECK_HEADERS(machine/soundcard.h sys/soundcard.h soundcard.h, 
    have_sound_header=yes)
  # Emulation library used on NetBSD.
  AC_CHECK_LIB(ossaudio, _oss_ioctl, LIBSOUND=-lossaudio, LIBSOUND=)
  AC_SUBST(LIBSOUND)

  ALSA_REQUIRED=1.0.0
  ALSA_MODULES="alsa >= $ALSA_REQUIRED"
  PKG_CHECK_MODULES(ALSA, $ALSA_MODULES, HAVE_ALSA=yes, HAVE_ALSA=no)
  if test $HAVE_ALSA = yes; then
    SAVE_CFLAGS="$CFLAGS"
    SAVE_LDFLAGS="$LDFLAGS"
    CFLAGS="$ALSA_CFLAGS $CFLAGS"
    LDFLAGS="$ALSA_LIBS $LDFLAGS"
    AC_TRY_COMPILE([#include <asoundlib.h>], [snd_lib_error_set_handler (0);],
                    emacs_alsa_normal=yes,
                    emacs_alsa_normal=no)
    if test "$emacs_alsa_normal" != yes; then
      AC_TRY_COMPILE([#include <alsa/asoundlib.h>],
                     [snd_lib_error_set_handler (0);],
                     emacs_alsa_subdir=yes,
                     emacs_alsa_subdir=no)
      if test "$emacs_alsa_subdir" != yes; then
        AC_MSG_ERROR([pkg-config found alsa, but it does not compile.  See config.log for error messages.])
      fi
      ALSA_CFLAGS="$ALSA_CFLAGS -DALSA_SUBDIR_INCLUDE"
    fi

    CFLAGS="$SAVE_CFLAGS"
    LDFLAGS="$SAVE_LDFLAGS"
    LIBSOUND="$LIBSOUND $ALSA_LIBS"
    CFLAGS_SOUND="$CFLAGS_SOUND $ALSA_CFLAGS"
    AC_DEFINE(HAVE_ALSA, 1, [Define to 1 if ALSA is available.])
  fi

  dnl Define HAVE_SOUND if we have sound support.  We know it works and
  dnl compiles only on the specified platforms.  For others, it
  dnl probably doesn't make sense to try.
  if test x$have_sound_header = xyes || test $HAVE_ALSA = yes; then
     case "$opsys" in
       dnl defined __FreeBSD__ || defined __NetBSD__ || defined __linux__
       gnu-linux|freebsd|netbsd)
         AC_DEFINE(HAVE_SOUND, 1, [Define to 1 if you have sound support.])
         ;;
     esac
  fi

  AC_SUBST(CFLAGS_SOUND)
fi

dnl checks for header files
AC_CHECK_HEADERS(sys/select.h sys/timeb.h sys/time.h unistd.h utime.h \
  linux/version.h sys/systeminfo.h termios.h limits.h string.h stdlib.h \
  stdio_ext.h fcntl.h strings.h coff.h pty.h sys/mman.h \
  sys/param.h sys/vlimit.h sys/resource.h locale.h sys/_mbstate_t.h \
  sys/utsname.h pwd.h utmp.h dirent.h util.h)

AC_MSG_CHECKING(if personality LINUX32 can be set)
AC_TRY_COMPILE([#include <sys/personality.h>], [personality (PER_LINUX32)],
               emacs_cv_personality_linux32=yes,
               emacs_cv_personality_linux32=no)
AC_MSG_RESULT($emacs_cv_personality_linux32)

if test $emacs_cv_personality_linux32 = yes; then
  AC_DEFINE(HAVE_PERSONALITY_LINUX32, 1,
            [Define to 1 if personality LINUX32 can be set.])
fi

dnl On Solaris 8 there's a compilation warning for term.h because
dnl it doesn't define `bool'.
AC_CHECK_HEADERS(term.h, , , -)
AC_HEADER_STDC
AC_HEADER_TIME
AC_CHECK_DECLS([sys_siglist])
if test $ac_cv_have_decl_sys_siglist != yes; then
  # For Tru64, at least:
  AC_CHECK_DECLS([__sys_siglist])
  if test $ac_cv_have_decl___sys_siglist = yes; then
    AC_DEFINE(sys_siglist, __sys_siglist,
              [Define to any substitute for sys_siglist.])
  fi
fi
AC_HEADER_SYS_WAIT

dnl Some systems have utime.h but don't declare the struct anyplace.
AC_CACHE_CHECK(for struct utimbuf, emacs_cv_struct_utimbuf,
AC_TRY_COMPILE([#ifdef TIME_WITH_SYS_TIME
#include <sys/time.h>
#include <time.h>
#else
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#else
#include <time.h>
#endif
#endif
#ifdef HAVE_UTIME_H
#include <utime.h>
#endif], [static struct utimbuf x; x.actime = x.modtime;],
  emacs_cv_struct_utimbuf=yes, emacs_cv_struct_utimbuf=no))
if test $emacs_cv_struct_utimbuf = yes; then
  AC_DEFINE(HAVE_STRUCT_UTIMBUF, 1, [Define to 1 if `struct utimbuf' is declared by <utime.h>.])
fi

dnl checks for typedefs
AC_TYPE_SIGNAL

dnl Check for speed_t typedef.
AC_CACHE_CHECK(for speed_t, emacs_cv_speed_t,
  [AC_TRY_COMPILE([#include <termios.h>], [speed_t x = 1;],
    emacs_cv_speed_t=yes, emacs_cv_speed_t=no)])
if test $emacs_cv_speed_t = yes; then
  AC_DEFINE(HAVE_SPEED_T, 1,
           [Define to 1 if `speed_t' is declared by <termios.h>.])
fi

AC_CACHE_CHECK(for struct timeval, emacs_cv_struct_timeval,
AC_TRY_COMPILE([#ifdef TIME_WITH_SYS_TIME
#include <sys/time.h>
#include <time.h>
#else
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#else
#include <time.h>
#endif
#endif], [static struct timeval x; x.tv_sec = x.tv_usec;],
  emacs_cv_struct_timeval=yes, emacs_cv_struct_timeval=no))
HAVE_TIMEVAL=$emacs_cv_struct_timeval
if test $emacs_cv_struct_timeval = yes; then
  AC_DEFINE(HAVE_TIMEVAL, 1, [Define to 1 if `struct timeval' is declared by <sys/time.h>.])
fi

AC_CACHE_CHECK(for struct exception, emacs_cv_struct_exception,
AC_TRY_COMPILE([#include <math.h>],
[static struct exception x; x.arg1 = x.arg2 = x.retval; x.name = ""; x.type = 1;],
  emacs_cv_struct_exception=yes, emacs_cv_struct_exception=no))
HAVE_EXCEPTION=$emacs_cv_struct_exception
if test $emacs_cv_struct_exception != yes; then
  AC_DEFINE(NO_MATHERR, 1, [Define to 1 if you don't have struct exception in math.h.])
fi

AC_CHECK_HEADERS(sys/socket.h)
AC_CHECK_HEADERS(net/if.h, , , [AC_INCLUDES_DEFAULT
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif])

dnl checks for structure members
AC_STRUCT_TM
AC_STRUCT_TIMEZONE
AC_CHECK_MEMBER(struct tm.tm_gmtoff,
                [AC_DEFINE(HAVE_TM_GMTOFF, 1,
                           [Define to 1 if `tm_gmtoff' is member of `struct tm'.])],,
                [#include <time.h>])
AC_CHECK_MEMBERS([struct ifreq.ifr_flags, struct ifreq.ifr_hwaddr,
                  struct ifreq.ifr_netmask, struct ifreq.ifr_broadaddr,
                  struct ifreq.ifr_addr], , ,
                 [AC_INCLUDES_DEFAULT
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if HAVE_NET_IF_H
#include <net/if.h>
#endif])

dnl checks for compiler characteristics

dnl Testing __STDC__ to determine prototype support isn't good enough.
dnl DEC C, for instance, doesn't define it with default options, and
dnl is used on 64-bit systems (OSF Alphas).  Similarly for volatile
dnl and void *.
AC_C_PROTOTYPES
AC_C_VOLATILE
AC_C_CONST
dnl This isn't useful because we can't turn on use of `inline' unless
dnl the compiler groks `extern inline'.
dnl AC_C_INLINE
AC_CACHE_CHECK([for void * support], emacs_cv_void_star,
  [AC_TRY_COMPILE(, [void * foo;],
                   emacs_cv_void_star=yes, emacs_cv_void_star=no)])
if test $emacs_cv_void_star = yes; then
  AC_DEFINE(POINTER_TYPE, void)
else
  AC_DEFINE(POINTER_TYPE, char)
fi
AH_TEMPLATE(POINTER_TYPE,
            [Define as `void' if your compiler accepts `void *'; otherwise
             define as `char'.])dnl

dnl Check for endianess
AC_C_BIGENDIAN

dnl check for Make feature
AC_PROG_MAKE_SET

DEPFLAGS=
MKDEPDIR=":"
deps_frag=deps.mk
dnl check for GNU Make if we have GCC and autodepend is on.
if test "$GCC" = yes && test "$ac_enable_autodepend" = yes; then
   AC_MSG_CHECKING([whether we are using GNU Make])
   HAVE_GNU_MAKE=no
   testval=`make --version 2>/dev/null | grep 'GNU Make'`
   if test "x$testval" != x; then
      HAVE_GNU_MAKE=yes
   else
      ac_enable_autodepend=no
   fi
   AC_MSG_RESULT([$HAVE_GNU_MAKE])
   if test $HAVE_GNU_MAKE = yes; then
      AC_MSG_CHECKING([whether gcc understands -MMD -MF])
      SAVE_CFLAGS="$CFLAGS"
      CFLAGS="$CFLAGS -MMD -MF deps.d"
      AC_TRY_COMPILE([], [], , ac_enable_autodepend=no)
      CFLAGS="$SAVE_CFLAGS"
      test -f deps.d || ac_enable_autodepend=no
      rm -rf deps.d
      AC_MSG_RESULT([$ac_enable_autodepend])
   fi
   if test $ac_enable_autodepend = yes; then
      DEPFLAGS='-MMD -MF ${DEPDIR}/$*.d'
      ## In parallel builds, another make might create depdir between
      ## the first test and mkdir, so stick another test on the end.
      ## Or use mkinstalldirs?  mkdir -p is not portable.
      MKDEPDIR='test -d ${DEPDIR} || mkdir ${DEPDIR} || test -d ${DEPDIR}'
      deps_frag=autodeps.mk
   fi
fi
deps_frag=$srcdir/src/$deps_frag
AC_SUBST(MKDEPDIR)
AC_SUBST(DEPFLAGS)
AC_SUBST_FILE(deps_frag)


dnl checks for operating system services
AC_SYS_LONG_FILE_NAMES

#### Choose a window system.

AC_PATH_X
if test "$no_x" = yes; then
  window_system=none
else
  window_system=x11
fi

## Workaround for bug in autoconf <= 2.62.
## http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg01551.html
## No need to do anything special for these standard directories.
if test -n "${x_libraries}" && test x"${x_libraries}" != xNONE; then

   x_libraries=`echo :${x_libraries}: | sed -e 's|:/usr/lib64:|:|g' -e 's|:/lib64:|:|g' -e 's|^:||' -e 's|:$||'`

fi

LD_SWITCH_X_SITE_AUX=
LD_SWITCH_X_SITE_AUX_RPATH=
if test "${x_libraries}" != NONE; then
  if test -n "${x_libraries}"; then
    LD_SWITCH_X_SITE=-L`echo ${x_libraries} | sed -e "s/:/ -L/g"`
    LD_SWITCH_X_SITE_AUX=-R`echo ${x_libraries} | sed -e "s/:/ -R/g"`
    LD_SWITCH_X_SITE_AUX_RPATH=`echo ${LD_SWITCH_X_SITE_AUX} | sed -e 's/-R/-Wl,-rpath,/'`
  fi
  x_default_search_path=""
  x_search_path=${x_libraries}
  if test -z "${x_search_path}"; then
    x_search_path=/usr/lib
  fi
  for x_library in `echo ${x_search_path}: | \
                    sed -e "s/:/ /g" -e p -e "s:/lib[[^ /]]* :/share :g"`; do
    x_search_path="\
${x_library}/X11/%L/%T/%N%C%S:\
${x_library}/X11/%l/%T/%N%C%S:\
${x_library}/X11/%T/%N%C%S:\
${x_library}/X11/%L/%T/%N%S:\
${x_library}/X11/%l/%T/%N%S:\
${x_library}/X11/%T/%N%S"
    if test x"${x_default_search_path}" = x; then
      x_default_search_path=${x_search_path}
    else
      x_default_search_path="${x_search_path}:${x_default_search_path}"
    fi
  done
fi
AC_SUBST(LD_SWITCH_X_SITE_AUX)
AC_SUBST(LD_SWITCH_X_SITE_AUX_RPATH)

if test "${x_includes}" != NONE && test -n "${x_includes}"; then
  C_SWITCH_X_SITE=-I`echo ${x_includes} | sed -e "s/:/ -I/g"`
fi

if test x"${x_includes}" = x; then
  bitmapdir=/usr/include/X11/bitmaps
else
  # accumulate include directories that have X11 bitmap subdirectories
  bmd_acc="dummyval"
  for bmd in `echo ${x_includes} | sed -e "s/:/ /g"`; do
    if test -d "${bmd}/X11/bitmaps"; then
      bmd_acc="${bmd_acc}:${bmd}/X11/bitmaps"
    fi
    if test -d "${bmd}/bitmaps"; then
      bmd_acc="${bmd_acc}:${bmd}/bitmaps"
    fi
  done
  if test ${bmd_acc} != "dummyval"; then
    bitmapdir=`echo ${bmd_acc} | sed -e "s/^dummyval://"`
  fi
fi

HAVE_NS=no
NS_IMPL_COCOA=no
NS_IMPL_GNUSTEP=no
tmp_CPPFLAGS="$CPPFLAGS"
tmp_CFLAGS="$CFLAGS"
CPPFLAGS="$CPPFLAGS -x objective-c"
CFLAGS="$CFLAGS -x objective-c"
TEMACS_LDFLAGS2="\${LDFLAGS}"
dnl I don't think it's especially important, but src/Makefile.in
dnl (now the only user of ns_appdir) used to go to the trouble of adding a
dnl trailing "/" to it, so now we do it here.
if test "${with_ns}" != no; then
  if test "${opsys}" = darwin; then
     NS_IMPL_COCOA=yes
     ns_appdir=`pwd`/nextstep/Emacs.app
     ns_appbindir=${ns_appdir}/Contents/MacOS/
     ns_appresdir=${ns_appdir}/Contents/Resources
     ns_appsrc=${srcdir}/nextstep/Cocoa/Emacs.base
  elif test -f $GNUSTEP_CONFIG_FILE; then
     NS_IMPL_GNUSTEP=yes
     ns_appdir=`pwd`/nextstep/Emacs.app
     ns_appbindir=${ns_appdir}
     ns_appresdir=${ns_appdir}/Resources
     ns_appsrc=${srcdir}/nextstep/GNUstep/Emacs.base
     dnl FIXME sourcing this several times in subshells seems inefficient.
     GNUSTEP_SYSTEM_HEADERS="$(. $GNUSTEP_CONFIG_FILE; echo $GNUSTEP_SYSTEM_HEADERS)"
     GNUSTEP_SYSTEM_LIBRARIES="$(. $GNUSTEP_CONFIG_FILE; echo $GNUSTEP_SYSTEM_LIBRARIES)"
     dnl I seemed to need these as well with GNUstep-startup 0.25.
     GNUSTEP_LOCAL_HEADERS="$(. $GNUSTEP_CONFIG_FILE; echo $GNUSTEP_LOCAL_HEADERS)"
     GNUSTEP_LOCAL_LIBRARIES="$(. $GNUSTEP_CONFIG_FILE; echo $GNUSTEP_LOCAL_LIBRARIES)"
     test "x${GNUSTEP_LOCAL_HEADERS}" != "x" && \
       GNUSTEP_LOCAL_HEADERS="-I${GNUSTEP_LOCAL_HEADERS}"
     test "x${GNUSTEP_LOCAL_LIBRARIES}" != "x" && \
       GNUSTEP_LOCAL_LIBRARIES="-L${GNUSTEP_LOCAL_LIBRARIES}"
     CPPFLAGS="$CPPFLAGS -I${GNUSTEP_SYSTEM_HEADERS} ${GNUSTEP_LOCAL_HEADERS}"
     CFLAGS="$CFLAGS -I${GNUSTEP_SYSTEM_HEADERS} ${GNUSTEP_LOCAL_HEADERS}"
     LDFLAGS="$LDFLAGS -L${GNUSTEP_SYSTEM_LIBRARIES} ${GNUSTEP_LOCAL_LIBRARIES}"
     LIB_STANDARD=
     START_FILES=
     TEMACS_LDFLAGS2=
  fi
  AC_CHECK_HEADER([AppKit/AppKit.h], [HAVE_NS=yes],
                  [AC_MSG_ERROR([`--with-ns' was specified, but the include
  files are missing or cannot be compiled.])])
  NS_HAVE_NSINTEGER=yes
  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <Foundation/NSObjCRuntime.h>],
                                     [NSInteger i;])],
                    ns_have_nsinteger=yes,
                    ns_have_nsinteger=no)
  if test $ns_have_nsinteger = no; then
    NS_HAVE_NSINTEGER=no
  fi
fi
AC_SUBST(TEMACS_LDFLAGS2)

ns_frag=/dev/null
NS_OBJ=
NS_SUPPORT=
if test "${HAVE_NS}" = yes; then
  window_system=nextstep
  with_xft=no
  # set up packaging dirs
  exec_prefix=${ns_appbindir}
  libexecdir=${ns_appbindir}/libexec
  if test "${EN_NS_SELF_CONTAINED}" = yes; then
     prefix=${ns_appresdir}
  fi
  ns_frag=$srcdir/src/ns.mk
  NS_OBJ="nsterm.o nsfns.o nsmenu.o nsselect.o nsimage.o nsfont.o fontset.o fringe.o image.o"
  NS_SUPPORT="\${lispsource}/emacs-lisp/easymenu.elc \${lispsource}/term/ns-win.elc"
fi
CFLAGS="$tmp_CFLAGS"
CPPFLAGS="$tmp_CPPFLAGS"
AC_SUBST(NS_OBJ)
AC_SUBST(NS_SUPPORT)
AC_SUBST(LIB_STANDARD)
AC_SUBST_FILE(ns_frag)

case "${window_system}" in
  x11 )
    HAVE_X_WINDOWS=yes
    HAVE_X11=yes
    case "${with_x_toolkit}" in
      athena | lucid ) USE_X_TOOLKIT=LUCID ;;
      motif ) USE_X_TOOLKIT=MOTIF ;;
      gtk ) with_gtk=yes
dnl Dont set this for GTK.  A lot of tests below assumes Xt when
dnl USE_X_TOOLKIT is set.
            USE_X_TOOLKIT=none ;;
      gtk3 ) with_gtk3=yes
             USE_X_TOOLKIT=none ;;
      no ) USE_X_TOOLKIT=none ;;
dnl If user did not say whether to use a toolkit, make this decision later:
dnl use the toolkit if we have gtk, or X11R5 or newer.
      * ) USE_X_TOOLKIT=maybe ;;
    esac
  ;;
  nextstep | none )
    HAVE_X_WINDOWS=no
    HAVE_X11=no
    USE_X_TOOLKIT=none
  ;;
esac

if test "$window_system" = none && test "X$with_x" != "Xno"; then
   AC_CHECK_PROG(HAVE_XSERVER, X, true, false)
   if test "$HAVE_XSERVER" = true ||
      test -n "$DISPLAY" ||
      test "`echo /usr/lib/libX11.*`" != "/usr/lib/libX11.*"; then
        AC_MSG_ERROR([You seem to be running X, but no X development libraries
were found.  You should install the relevant development files for X
and for the toolkit you want, such as Gtk+, Lesstif or Motif.  Also make
sure you have development files for image handling, i.e.
tiff, gif, jpeg, png and xpm.
If you are sure you want Emacs compiled without X window support, pass
  --without-x
to configure.])
   fi
fi

### If we're using X11, we should use the X menu package.
HAVE_MENUS=no
case ${HAVE_X11} in
  yes ) HAVE_MENUS=yes ;;
esac

# Do the opsystem or machine files prohibit the use of the GNU malloc?
# Assume not, until told otherwise.
GNU_MALLOC=yes
doug_lea_malloc=yes
AC_CHECK_FUNC(malloc_get_state, ,doug_lea_malloc=no)
AC_CHECK_FUNC(malloc_set_state, ,doug_lea_malloc=no)
AC_CACHE_CHECK(whether __after_morecore_hook exists,
               emacs_cv_var___after_morecore_hook,
[AC_TRY_LINK([extern void (* __after_morecore_hook)();],[__after_morecore_hook = 0],
  emacs_cv_var___after_morecore_hook=yes,
  emacs_cv_var___after_morecore_hook=no)])
if test $emacs_cv_var___after_morecore_hook = no; then
  doug_lea_malloc=no
fi


dnl See comments in aix4-2.h about maybe using system malloc there.
system_malloc=no
case "$opsys" in
  ## darwin ld insists on the use of malloc routines in the System framework.
  darwin|sol2-10) system_malloc=yes ;;
esac

if test "${system_malloc}" = "yes"; then
  AC_DEFINE(SYSTEM_MALLOC, 1, [Define to use system malloc.])
  GNU_MALLOC=no
  GNU_MALLOC_reason="
    (The GNU allocators don't work with this system configuration.)"
  GMALLOC_OBJ=
  VMLIMIT_OBJ=
else
  test "$doug_lea_malloc" != "yes" && GMALLOC_OBJ=gmalloc.o
  VMLIMIT_OBJ=vm-limit.o
fi
AC_SUBST(GMALLOC_OBJ)
AC_SUBST(VMLIMIT_OBJ)

if test "$doug_lea_malloc" = "yes" ; then
  if test "$GNU_MALLOC" = yes ; then
    GNU_MALLOC_reason="
      (Using Doug Lea's new malloc from the GNU C Library.)"
  fi
  AC_DEFINE(DOUG_LEA_MALLOC, 1,
            [Define to 1 if you are using the GNU C Library.])

  ## Use mmap directly for allocating larger buffers.
  ## FIXME this comes from src/s/{gnu,gnu-linux}.h:
  ## #ifdef DOUG_LEA_MALLOC; #undef REL_ALLOC; #endif
  ## Does the AC_FUNC_MMAP test below make this check unecessary?
  case "$opsys" in
    gnu*) REL_ALLOC=no ;;
  esac
fi

if test x"${REL_ALLOC}" = x; then
  REL_ALLOC=${GNU_MALLOC}
fi

use_mmap_for_buffers=no
case "$opsys" in
  freebsd|irix6-5) use_mmap_for_buffers=yes ;;
esac

AC_FUNC_MMAP
if test $use_mmap_for_buffers = yes; then
  AC_DEFINE(USE_MMAP_FOR_BUFFERS, 1, [Define to use mmap to allocate buffer text.])
  REL_ALLOC=no
fi

LIBS="$LIBS_SYSTEM $LIBS"

dnl If found, this defines HAVE_LIBDNET, which m/pmax.h checks,
dnl and also adds -ldnet to LIBS, which Autoconf uses for checks.
AC_CHECK_LIB(dnet, dnet_ntoa)
dnl This causes -lresolv to get used in subsequent tests,
dnl which causes failures on some systems such as HPUX 9.
dnl AC_CHECK_LIB(resolv, gethostbyname)

dnl FIXME replace main with a function we actually want from this library.
AC_CHECK_LIB(Xbsd, main, LD_SWITCH_X_SITE="$LD_SWITCH_X_SITE -lXbsd")

AC_CHECK_LIB(pthreads, cma_open)

## Note: when using cpp in s/aix4.2.h, this definition depended on
## HAVE_LIBPTHREADS.  That was not defined earlier in configure when
## the system file was sourced.  Hence the value of LIBS_SYSTEM
## added to LIBS in configure would never contain the pthreads part,
## but the value used in Makefiles might.  FIXME?
##
## -lpthreads seems to be necessary for Xlib in X11R6, and should
## be harmless on older versions of X where it happens to exist.
test "$opsys" = "aix4-2" && \
  test $ac_cv_lib_pthreads_cma_open = yes && \
  LIBS_SYSTEM="$LIBS_SYSTEM -lpthreads"

dnl Check for need for bigtoc support on IBM AIX

case ${host_os} in
aix*)
  AC_CACHE_CHECK([for -bbigtoc option], [gdb_cv_bigtoc], [
    case $GCC in
    yes) gdb_cv_bigtoc=-Wl,-bbigtoc ;;
    *) gdb_cv_bigtoc=-bbigtoc ;;
    esac

    LDFLAGS=$LDFLAGS\ $gdb_cv_bigtoc
    AC_TRY_LINK([], [int i;], [], [gdb_cv_bigtoc=])
  ])
  ;;
esac

# Change CFLAGS and CPPFLAGS temporarily so that C_SWITCH_X_SITE gets
# used for the tests that follow.  We set them back to REAL_CFLAGS and
# REAL_CPPFLAGS later on.

REAL_CFLAGS="$CFLAGS"
REAL_CPPFLAGS="$CPPFLAGS"

if test "${HAVE_X11}" = "yes"; then
  DEFS="$C_SWITCH_X_SITE $DEFS"
  LDFLAGS="$LDFLAGS $LD_SWITCH_X_SITE"
  LIBS="-lX11 $LIBS"
  CFLAGS="$C_SWITCH_X_SITE $CFLAGS"
  CPPFLAGS="$C_SWITCH_X_SITE $CPPFLAGS"

  # On Solaris, arrange for LD_RUN_PATH to point to the X libraries for tests.
  # This is handled by LD_SWITCH_X_SITE_AUX during the real build,
  # but it's more convenient here to set LD_RUN_PATH
  # since this also works on hosts that don't understand LD_SWITCH_X_SITE_AUX.
  if test "${x_libraries}" != NONE && test -n "${x_libraries}"; then
    LD_RUN_PATH=$x_libraries${LD_RUN_PATH+:}$LD_RUN_PATH
    export LD_RUN_PATH
  fi

  if test "${opsys}" = "gnu-linux"; then
    AC_MSG_CHECKING(whether X on GNU/Linux needs -b to link)
    AC_TRY_LINK([],
     [XOpenDisplay ("foo");],
     [xlinux_first_failure=no],
     [xlinux_first_failure=yes])
    if test "${xlinux_first_failure}" = "yes"; then
      OLD_LD_SWITCH_X_SITE="$LD_SWITCH_X_SITE"
      OLD_C_SWITCH_X_SITE="$C_SWITCH_X_SITE"
      OLD_CPPFLAGS="$CPPFLAGS"
      OLD_LIBS="$LIBS"
      LD_SWITCH_X_SITE="$LD_SWITCH_X_SITE -b i486-linuxaout"
      C_SWITCH_X_SITE="$C_SWITCH_X_SITE -b i486-linuxaout"
      CPPFLAGS="$CPPFLAGS -b i486-linuxaout"
      LIBS="$LIBS -b i486-linuxaout"
      AC_TRY_LINK([],
       [XOpenDisplay ("foo");],
       [xlinux_second_failure=no],
       [xlinux_second_failure=yes])
      if test "${xlinux_second_failure}" = "yes"; then
        # If we get the same failure with -b, there is no use adding -b.
        # So take it out.  This plays safe.
        LD_SWITCH_X_SITE="$OLD_LD_SWITCH_X_SITE"
        C_SWITCH_X_SITE="$OLD_C_SWITCH_X_SITE"
        CPPFLAGS="$OLD_CPPFLAGS"
        LIBS="$OLD_LIBS"
        AC_MSG_RESULT(no)
      else
        AC_MSG_RESULT(yes)
      fi
    else
      AC_MSG_RESULT(no)
    fi
  fi

  # Reportedly, some broken Solaris systems have XKBlib.h but are missing
  # header files included from there.
  AC_MSG_CHECKING(for Xkb)
  AC_TRY_LINK([#include <X11/Xlib.h>
#include <X11/XKBlib.h>],
        [XkbDescPtr kb = XkbGetKeyboard (0, XkbAllComponentsMask, XkbUseCoreKbd);],
        emacs_xkb=yes, emacs_xkb=no)
  AC_MSG_RESULT($emacs_xkb)
  if test $emacs_xkb = yes; then
    AC_DEFINE(HAVE_XKBGETKEYBOARD, 1, [Define to 1 if you have the XkbGetKeyboard function.])
  fi

  AC_CHECK_FUNCS(XrmSetDatabase XScreenResourceString \
XScreenNumberOfScreen XSetWMProtocols)
fi

if test "${window_system}" = "x11"; then
  AC_MSG_CHECKING(X11 version 6)
  AC_CACHE_VAL(emacs_cv_x11_version_6,
  [AC_TRY_LINK([#include <X11/Xlib.h>],
[#if XlibSpecificationRelease < 6
fail;
#endif
], emacs_cv_x11_version_6=yes, emacs_cv_x11_version_6=no)])
  if test $emacs_cv_x11_version_6 = yes; then
    AC_MSG_RESULT(6 or newer)
    AC_DEFINE(HAVE_X11R6, 1,
              [Define to 1 if you have the X11R6 or newer version of Xlib.])
    AC_DEFINE(HAVE_X_I18N, 1, [Define if you have usable i18n support.])
    ## inoue@ainet.or.jp says Solaris has a bug related to X11R6-style
    ## XIM support.
    case "$opsys" in
      sol2-*) : ;;
      *) AC_DEFINE(HAVE_X11R6_XIM, 1,
           [Define if you have usable X11R6-style XIM support.])
         ;;
    esac
  else
    AC_MSG_RESULT(before 6)
  fi
fi


### Use -lrsvg-2 if available, unless `--with-rsvg=no' is specified.
HAVE_RSVG=no
if test "${HAVE_X11}" = "yes" || test "${NS_IMPL_GNUSTEP}" = "yes"; then
  if test "${with_rsvg}" != "no"; then
    RSVG_REQUIRED=2.11.0
    RSVG_MODULE="librsvg-2.0 >= $RSVG_REQUIRED"

    PKG_CHECK_MODULES(RSVG, $RSVG_MODULE, HAVE_RSVG=yes, :)
    AC_SUBST(RSVG_CFLAGS)
    AC_SUBST(RSVG_LIBS)

    if test $HAVE_RSVG = yes; then
      AC_DEFINE(HAVE_RSVG, 1, [Define to 1 if using librsvg.])
      CFLAGS="$CFLAGS $RSVG_CFLAGS"
      LIBS="$RSVG_LIBS $LIBS"
    fi
  fi
fi

HAVE_IMAGEMAGICK=no
if test "${HAVE_X11}" = "yes"; then
  if test "${with_imagemagick}" != "no"; then
    IMAGEMAGICK_MODULE="Wand"
    PKG_CHECK_MODULES(IMAGEMAGICK, $IMAGEMAGICK_MODULE, HAVE_IMAGEMAGICK=yes, :)
    AC_SUBST(IMAGEMAGICK_CFLAGS)
    AC_SUBST(IMAGEMAGICK_LIBS)
  
    if test $HAVE_IMAGEMAGICK = yes; then
      AC_DEFINE(HAVE_IMAGEMAGICK, 1, [Define to 1 if using imagemagick.])
      CFLAGS="$CFLAGS $IMAGEMAGICK_CFLAGS"
      LIBS="$IMAGEMAGICK_LIBS $LIBS"
      AC_CHECK_FUNCS(MagickExportImagePixels)
    fi
  fi
fi


HAVE_GTK=no
if test "${with_gtk3}" = "yes"; then
  GLIB_REQUIRED=2.6
  GTK_REQUIRED=2.90
  GTK_MODULES="gtk+-3.0 >= $GTK_REQUIRED glib-2.0 >= $GLIB_REQUIRED"

  dnl Checks for libraries.
  PKG_CHECK_MODULES(GTK, $GTK_MODULES, pkg_check_gtk=yes, pkg_check_gtk=no)
  if test "$pkg_check_gtk" = "no" && test "$USE_X_TOOLKIT" != "maybe"; then
     AC_MSG_ERROR($GTK_PKG_ERRORS)
  fi
fi

if test "$pkg_check_gtk" != "yes"; then
  HAVE_GTK=no
if test "${with_gtk}" = "yes" || test "$USE_X_TOOLKIT" = "maybe"; then
  GLIB_REQUIRED=2.6
  GTK_REQUIRED=2.6
  GTK_MODULES="gtk+-2.0 >= $GTK_REQUIRED glib-2.0 >= $GLIB_REQUIRED"

  dnl Checks for libraries.
  PKG_CHECK_MODULES(GTK, $GTK_MODULES, pkg_check_gtk=yes, pkg_check_gtk=no)
  if test "$pkg_check_gtk" = "no" && test "$USE_X_TOOLKIT" != "maybe"; then
     AC_MSG_ERROR($GTK_PKG_ERRORS)
  fi
fi
fi

GTK_OBJ=
if test x"$pkg_check_gtk" = xyes; then

  AC_SUBST(GTK_CFLAGS)
  AC_SUBST(GTK_LIBS)
  C_SWITCH_X_SITE="$C_SWITCH_X_SITE $GTK_CFLAGS"
  CFLAGS="$CFLAGS $GTK_CFLAGS"
  LIBS="$GTK_LIBS $LIBS"
  dnl Try to compile a simple GTK program.
  GTK_COMPILES=no
  AC_CHECK_FUNCS(gtk_main, GTK_COMPILES=yes)
  if test "${GTK_COMPILES}" != "yes"; then
    if test "$USE_X_TOOLKIT" != "maybe"; then
      AC_MSG_ERROR([Gtk+ wanted, but it does not compile, see config.log.  Maybe some x11-devel files missing?]);
    fi
  else
    HAVE_GTK=yes
    AC_DEFINE(USE_GTK, 1, [Define to 1 if using GTK.])
    GTK_OBJ=gtkutil.o
    USE_X_TOOLKIT=none
    if $PKG_CONFIG --atleast-version=2.10 gtk+-2.0; then
      :
    else
      AC_MSG_WARN([[Your version of Gtk+ will have problems with
       closing open displays.  This is no problem if you just use
       one display, but if you use more than one and close one of them
       Emacs may crash.]])
      sleep 3
    fi
  fi

fi
AC_SUBST(GTK_OBJ)


if test "${HAVE_GTK}" = "yes"; then

  dnl  GTK scrollbars resemble toolkit scrollbars a lot, so to avoid
  dnl  a lot if #ifdef:s, say we have toolkit scrollbars.
  if test "$with_toolkit_scroll_bars" != no; then
    with_toolkit_scroll_bars=yes
  fi

  dnl  Check if we have the old file selection dialog declared and
  dnl  in the link library.  In 2.x it may be in the library,
  dnl  but not declared if deprecated featured has been selected out.
  dnl  AC_CHECK_DECL checks for a macro, so check for GTK_TYPE_FILE_SELECTION.
  HAVE_GTK_FILE_SELECTION=no
  AC_CHECK_DECL(GTK_TYPE_FILE_SELECTION, HAVE_GTK_FILE_SELECTION=yes,
                   HAVE_GTK_FILE_SELECTION=no, [AC_INCLUDES_DEFAULT
#include <gtk/gtk.h>])
  if test "$HAVE_GTK_FILE_SELECTION" = yes; then
    AC_CHECK_FUNCS(gtk_file_selection_new)
  fi

  dnl Check if pthreads are available.  Emacs only needs this when using
  dnl gtk_file_chooser under Gnome.
    HAVE_GTK_AND_PTHREAD=no
    AC_CHECK_HEADERS(pthread.h)
    if test "$ac_cv_header_pthread_h"; then
      AC_CHECK_LIB(pthread, pthread_self, HAVE_GTK_AND_PTHREAD=yes)
    fi
    if test "$HAVE_GTK_AND_PTHREAD" = yes; then
      case "${canonical}" in
        *-hpux*) ;;
        *) GTK_LIBS="$GTK_LIBS -lpthread" ;;
      esac
      AC_DEFINE(HAVE_GTK_AND_PTHREAD, 1,
               [Define to 1 if you have GTK and pthread (-lpthread).])
    fi

  dnl Check for functions introduced in 2.14 and later.
  AC_CHECK_FUNCS(gtk_widget_get_window gtk_widget_set_has_window \
                 gtk_dialog_get_action_area gtk_widget_get_sensitive \
                 gtk_widget_get_mapped gtk_adjustment_get_page_size \
                 gtk_orientable_set_orientation)

fi

dnl D-Bus has been tested under GNU/Linux only.  Must be adapted for
dnl other platforms.  Support for higher D-Bus versions than 1.0 is
dnl also not configured.
HAVE_DBUS=no
DBUS_OBJ=
if test "${with_dbus}" = "yes"; then
   PKG_CHECK_MODULES(DBUS, dbus-1 >= 1.0, HAVE_DBUS=yes, HAVE_DBUS=no)
   if test "$HAVE_DBUS" = yes; then
     LIBS="$LIBS $DBUS_LIBS"
     AC_DEFINE(HAVE_DBUS, 1, [Define to 1 if using D-Bus.])
     AC_CHECK_FUNCS([dbus_watch_get_unix_fd])
     DBUS_OBJ=dbusbind.o
   fi
fi
AC_SUBST(DBUS_OBJ)

dnl GConf has been tested under GNU/Linux only.
dnl The version is really arbitrary, it is about the same age as Gtk+ 2.6.
HAVE_GCONF=no
if test "${HAVE_X11}" = "yes" && test "${with_gconf}" = "yes"; then
   PKG_CHECK_MODULES(GCONF, gconf-2.0 >= 2.13, HAVE_GCONF=yes, HAVE_GCONF=no)
   if test "$HAVE_GCONF" = yes; then
      AC_DEFINE(HAVE_GCONF, 1, [Define to 1 if using GConf.])
   fi
fi

dnl SELinux is available for GNU/Linux only.
HAVE_LIBSELINUX=no
LIBSELINUX_LIBS=
if test "${with_selinux}" = "yes"; then
   AC_CHECK_LIB([selinux], [lgetfilecon], HAVE_LIBSELINUX=yes, HAVE_LIBSELINUX=no)
   if test "$HAVE_LIBSELINUX" = yes; then
      AC_DEFINE(HAVE_LIBSELINUX, 1, [Define to 1 if using SELinux.])
      LIBSELINUX_LIBS=-lselinux
   fi
fi
AC_SUBST(LIBSELINUX_LIBS)

HAVE_GNUTLS=no
if test "${with_gnutls}" = "yes" ; then
  PKG_CHECK_MODULES([LIBGNUTLS], [gnutls >= 2.2.4], HAVE_GNUTLS=yes, HAVE_GNUTLS=no)
  if test "${HAVE_GNUTLS}" = "yes"; then
    AC_DEFINE(HAVE_GNUTLS, 1, [Define if using GnuTLS.])
  fi
fi
AC_SUBST(LIBGNUTLS_LIBS)
AC_SUBST(LIBGNUTLS_CFLAGS)

dnl Do not put whitespace before the #include statements below.
dnl Older compilers (eg sunos4 cc) choke on it.
HAVE_XAW3D=no
LUCID_LIBW=
if test x"${USE_X_TOOLKIT}" = xmaybe || test x"${USE_X_TOOLKIT}" = xLUCID; then
  if test "$with_xaw3d" != no; then
    AC_MSG_CHECKING(for xaw3d)
    AC_CACHE_VAL(emacs_cv_xaw3d,
    [AC_TRY_LINK([
#include <X11/Intrinsic.h>
#include <X11/Xaw3d/Simple.h>],
      [],
      emacs_cv_xaw3d=yes,
      emacs_cv_xaw3d=no)])
  else
    emacs_cv_xaw3d=no
  fi
  if test $emacs_cv_xaw3d = yes; then
    AC_MSG_RESULT([yes; using Lucid toolkit])
    USE_X_TOOLKIT=LUCID
    HAVE_XAW3D=yes
    LUCID_LIBW=-lXaw3d
    AC_DEFINE(HAVE_XAW3D, 1,
              [Define to 1 if you have the Xaw3d library (-lXaw3d).])
  else
    AC_MSG_RESULT(no)
    AC_MSG_CHECKING(for libXaw)
    AC_CACHE_VAL(emacs_cv_xaw,
    [AC_TRY_LINK([
#include <X11/Intrinsic.h>
#include <X11/Xaw/Simple.h>],
      [],
      emacs_cv_xaw=yes,
      emacs_cv_xaw=no)])
    if test $emacs_cv_xaw = yes; then
      AC_MSG_RESULT([yes; using Lucid toolkit])
      USE_X_TOOLKIT=LUCID
      LUCID_LIBW=-lXaw
    elif test x"${USE_X_TOOLKIT}" = xLUCID; then
      AC_MSG_ERROR([Lucid toolkit requires X11/Xaw include files])
    else
      AC_MSG_RESULT([no; do not use toolkit by default])
      USE_X_TOOLKIT=none
    fi
  fi
fi

X_TOOLKIT_TYPE=$USE_X_TOOLKIT

LIBXTR6=
if test "${USE_X_TOOLKIT}" != "none"; then
  AC_MSG_CHECKING(X11 toolkit version)
  AC_CACHE_VAL(emacs_cv_x11_toolkit_version_6,
  [AC_TRY_LINK([#include <X11/Intrinsic.h>],
[#if XtSpecificationRelease < 6
fail;
#endif
], emacs_cv_x11_toolkit_version_6=yes, emacs_cv_x11_toolkit_version_6=no)])
  HAVE_X11XTR6=$emacs_cv_x11_toolkit_version_6
  if test $emacs_cv_x11_toolkit_version_6 = yes; then
    AC_MSG_RESULT(6 or newer)
    AC_DEFINE(HAVE_X11XTR6, 1,
              [Define to 1 if you have the X11R6 or newer version of Xt.])
    LIBXTR6="-lSM -lICE"
    case "$opsys" in
      ## Use libw.a along with X11R6 Xt.
      unixware) LIBXTR6="$LIBXTR6 -lw" ;;
    esac
  else
    AC_MSG_RESULT(before 6)
  fi

dnl If using toolkit, check whether libXmu.a exists.
dnl tranle@intellicorp.com says libXmu.a can need XtMalloc in libXt.a to link.
  OLDLIBS="$LIBS"
  if test x$HAVE_X11XTR6 = xyes; then
    LIBS="-lXt -lSM -lICE $LIBS"
  else
    LIBS="-lXt $LIBS"
  fi
  AC_CHECK_LIB(Xmu, XmuConvertStandardSelection)
  test $ac_cv_lib_Xmu_XmuConvertStandardSelection = no && LIBS="$OLDLIBS"
fi
AC_SUBST(LIBXTR6)

dnl FIXME the logic here seems weird, but this is what cpp was doing.
dnl Why not just test for libxmu in the normal way?
LIBXMU=-lXmu
case "$machine" in
  ## These machines don't supply Xmu.
  hpux* | aix4-2 )
    test "X$ac_cv_lib_Xmu_XmuConvertStandardSelection" != "Xyes" && LIBXMU=
    ;;
esac
AC_SUBST(LIBXMU)

# On Irix 6.5, at least, we need XShapeQueryExtension from -lXext for Xaw3D.
if test "${HAVE_X11}" = "yes"; then
  if test "${USE_X_TOOLKIT}" != "none"; then
    AC_CHECK_LIB(Xext, XShapeQueryExtension)
  fi
fi

LIBXP=
if test "${USE_X_TOOLKIT}" = "MOTIF"; then
  AC_CACHE_CHECK(for Motif version 2.1, emacs_cv_motif_version_2_1,
  [AC_TRY_COMPILE([#include <Xm/Xm.h>],
    [#if XmVERSION > 2 || (XmVERSION == 2 && XmREVISION >= 1)
int x = 5;
#else
Motif version prior to 2.1.
#endif],
    emacs_cv_motif_version_2_1=yes, emacs_cv_motif_version_2_1=no)])
  if test $emacs_cv_motif_version_2_1 = yes; then
    AC_CHECK_LIB(Xp, XpCreateContext, LIBXP=-lXp)
  else
    AC_CACHE_CHECK(for LessTif where some systems put it, emacs_cv_lesstif,
    # We put this in CFLAGS temporarily to precede other -I options
    # that might be in CFLAGS temporarily.
    # We put this in CPPFLAGS where it precedes the other -I options.
    OLD_CPPFLAGS=$CPPFLAGS
    OLD_CFLAGS=$CFLAGS
    CPPFLAGS="-I/usr/X11R6/LessTif/Motif1.2/include $CPPFLAGS"
    CFLAGS="-I/usr/X11R6/LessTif/Motif1.2/include $CFLAGS"
    [AC_TRY_COMPILE([#include </usr/X11R6/LessTif/Motif1.2/include/Xm/Xm.h>],
      [int x = 5;],
      emacs_cv_lesstif=yes, emacs_cv_lesstif=no)])
    if test $emacs_cv_lesstif = yes; then
      # Make sure this -I option remains in CPPFLAGS after it is set
      # back to REAL_CPPFLAGS.
      # There is no need to change REAL_CFLAGS, because REAL_CFLAGS does not
      # have those other -I options anyway.  Ultimately, having this
      # directory ultimately in CPPFLAGS will be enough.
      REAL_CPPFLAGS="-I/usr/X11R6/LessTif/Motif1.2/include $REAL_CPPFLAGS"
      LDFLAGS="-L/usr/X11R6/LessTif/Motif1.2/lib $LDFLAGS"
    else
      CFLAGS=$OLD_CFLAGS
      CPPFLAGS=$OLD_CPPFLAGS
    fi
  fi
fi

dnl Use toolkit scroll bars if configured for GTK or X toolkit and either
dnl using Motif or Xaw3d is available, and unless
dnl --with-toolkit-scroll-bars=no was specified.

AH_TEMPLATE(USE_TOOLKIT_SCROLL_BARS,
            [Define to 1 if we should use toolkit scroll bars.])dnl
USE_TOOLKIT_SCROLL_BARS=no
if test "${with_toolkit_scroll_bars}" != "no"; then
  if test "${USE_X_TOOLKIT}" != "none"; then
    if test "${USE_X_TOOLKIT}" = "MOTIF"; then
      AC_DEFINE(USE_TOOLKIT_SCROLL_BARS)
      HAVE_XAW3D=no
      USE_TOOLKIT_SCROLL_BARS=yes
    elif test "${HAVE_XAW3D}" = "yes"; then
      AC_DEFINE(USE_TOOLKIT_SCROLL_BARS)
      USE_TOOLKIT_SCROLL_BARS=yes
    fi
  elif test "${HAVE_GTK}" = "yes"; then
    AC_DEFINE(USE_TOOLKIT_SCROLL_BARS)
    USE_TOOLKIT_SCROLL_BARS=yes
  elif test "${HAVE_NS}" = "yes"; then
    AC_DEFINE(USE_TOOLKIT_SCROLL_BARS)
    USE_TOOLKIT_SCROLL_BARS=yes
  fi
fi

dnl See if XIM is available.
AC_TRY_COMPILE([
          #include <X11/Xlib.h>
          #include <X11/Xresource.h>],
         [XIMProc  callback;],
         [HAVE_XIM=yes
         AC_DEFINE(HAVE_XIM, 1, [Define to 1 if XIM is available])],
         HAVE_XIM=no)

dnl `--with-xim' now controls only the initial value of use_xim at run time.

if test "${with_xim}" != "no"; then
  AC_DEFINE(USE_XIM, 1,
            [Define to 1 if we should use XIM, if it is available.])
fi


if test "${HAVE_XIM}" != "no"; then
  late_CFLAGS=$CFLAGS
  if test "$GCC" = yes; then
    CFLAGS="$CFLAGS --pedantic-errors"
  fi
  AC_TRY_COMPILE([
#include <X11/Xlib.h>
#include <X11/Xresource.h>],
[Display *display;
XrmDatabase db;
char *res_name;
char *res_class;
XIMProc  callback;
XPointer *client_data;
#ifndef __GNUC__
/* If we're not using GCC, it's probably not XFree86, and this is
   probably right, but we can't use something like --pedantic-errors.  */
extern Bool XRegisterIMInstantiateCallback(Display*, XrmDatabase, char*,
                                           char*, XIMProc, XPointer*);
#endif
(void)XRegisterIMInstantiateCallback(display, db, res_name, res_class, callback,
   client_data);],
    [emacs_cv_arg6_star=yes])
  AH_TEMPLATE(XRegisterIMInstantiateCallback_arg6,
         [Define to the type of the 6th arg of XRegisterIMInstantiateCallback,
either XPointer or XPointer*.])dnl
  if test "$emacs_cv_arg6_star" = yes; then
    AC_DEFINE(XRegisterIMInstantiateCallback_arg6, [XPointer*])
  else
    AC_DEFINE(XRegisterIMInstantiateCallback_arg6, [XPointer])
  fi
  CFLAGS=$late_CFLAGS
fi

### Start of font-backend (under any platform) section.
# (nothing here yet -- this is a placeholder)
### End of font-backend (under any platform) section.

### Start of font-backend (under X11) section.
if test "${HAVE_X11}" = "yes"; then
   PKG_CHECK_MODULES(FONTCONFIG, fontconfig >= 2.2.0, HAVE_FC=yes, HAVE_FC=no)

   ## Use -lXft if available, unless `--with-xft=no'.
   HAVE_XFT=maybe
    if test "${HAVE_FC}" = "no" || test "x${with_x}" = "xno"; then
      with_xft="no";
    fi
    if test "x${with_xft}" != "xno"; then

      PKG_CHECK_MODULES(XFT, xft >= 0.13.0, , HAVE_XFT=no)
      ## Because xftfont.c uses XRenderQueryExtension, we also
      ## need to link to -lXrender.
      HAVE_XRENDER=no
      AC_CHECK_LIB(Xrender, XRenderQueryExtension, HAVE_XRENDER=yes)
      if test "$HAVE_XFT" != no && test "$HAVE_XRENDER" != no; then
        OLD_CPPFLAGS="$CPPFLAGS"
        OLD_CFLAGS="$CFLAGS"
        OLD_LIBS="$LIBS"
        CPPFLAGS="$CPPFLAGS $XFT_CFLAGS"
        CFLAGS="$CFLAGS $XFT_CFLAGS"
        XFT_LIBS="-lXrender $XFT_LIBS"
        LIBS="$XFT_LIBS $LIBS"
        AC_CHECK_HEADER(X11/Xft/Xft.h,
          AC_CHECK_LIB(Xft, XftFontOpen, HAVE_XFT=yes, , $XFT_LIBS))

        if test "${HAVE_XFT}" = "yes"; then
          AC_DEFINE(HAVE_XFT, 1, [Define to 1 if you have the Xft library.])
            AC_SUBST(XFT_LIBS)
          C_SWITCH_X_SITE="$C_SWITCH_X_SITE $XFT_CFLAGS"
        else
          CPPFLAGS="$OLD_CPPFLAGS"
          CFLAGS="$OLD_CFLAGS"
          LIBS="$OLD_LIBS"
        fi                        # "${HAVE_XFT}" = "yes"
      fi                          # "$HAVE_XFT" != no
    fi                            # "x${with_xft}" != "xno"

    dnl For the "Does Emacs use" message at the end.
    if test "$HAVE_XFT" != "yes"; then
       HAVE_XFT=no
    fi


    HAVE_FREETYPE=no
    ## We used to allow building with FreeType and without Xft.
    ## However, the ftx font backend driver is not in good shape.
    if test "${HAVE_XFT}" = "yes"; then
      dnl As we use Xft, we anyway use freetype.
      dnl There's no need for additional CFLAGS and LIBS.
      HAVE_FREETYPE=yes
      FONTCONFIG_CFLAGS=
      FONTCONFIG_LIBS=
    fi

    HAVE_LIBOTF=no
    if test "${HAVE_FREETYPE}" = "yes"; then
      AC_DEFINE(HAVE_FREETYPE, 1,
                [Define to 1 if using the freetype and fontconfig libraries.])
      if test "${with_libotf}" != "no"; then
        PKG_CHECK_MODULES(LIBOTF, libotf, HAVE_LIBOTF=yes,
                          HAVE_LIBOTF=no)
        if test "$HAVE_LIBOTF" = "yes"; then
          AC_DEFINE(HAVE_LIBOTF, 1, [Define to 1 if using libotf.])
          AC_CHECK_LIB(otf, OTF_get_variation_glyphs,
                       HAVE_OTF_GET_VARIATION_GLYPHS=yes,
                       HAVE_OTF_GET_VARIATION_GLYPHS=no)
          if test "${HAVE_OTF_GET_VARIATION_GLYPHS}" = "yes"; then
            AC_DEFINE(HAVE_OTF_GET_VARIATION_GLYPHS, 1,
                      [Define to 1 if libotf has OTF_get_variation_glyphs.])
          fi
        fi
      fi
    dnl FIXME should there be an error if HAVE_FREETYPE != yes?
    dnl Does the new font backend require it, or can it work without it?
    fi

    HAVE_M17N_FLT=no
    if test "${HAVE_LIBOTF}" = yes; then
      if test "${with_m17n_flt}" != "no"; then
        PKG_CHECK_MODULES(M17N_FLT, m17n-flt, HAVE_M17N_FLT=yes, HAVE_M17N_FLT=no)
        if test "$HAVE_M17N_FLT" = "yes"; then
          AC_DEFINE(HAVE_M17N_FLT, 1, [Define to 1 if using libm17n-flt.])
        fi
      fi
    fi
else
    HAVE_XFT=no
    HAVE_FREETYPE=no
    HAVE_LIBOTF=no
    HAVE_M17N_FLT=no
fi

### End of font-backend (under X11) section.

AC_SUBST(FREETYPE_CFLAGS)
AC_SUBST(FREETYPE_LIBS)
AC_SUBST(FONTCONFIG_CFLAGS)
AC_SUBST(FONTCONFIG_LIBS)
AC_SUBST(LIBOTF_CFLAGS)
AC_SUBST(LIBOTF_LIBS)
AC_SUBST(M17N_FLT_CFLAGS)
AC_SUBST(M17N_FLT_LIBS)

### Use -lXpm if available, unless `--with-xpm=no'.
HAVE_XPM=no
LIBXPM=
if test "${HAVE_X11}" = "yes"; then
  if test "${with_xpm}" != "no"; then
    AC_CHECK_HEADER(X11/xpm.h,
      [AC_CHECK_LIB(Xpm, XpmReadFileToPixmap, HAVE_XPM=yes, , -lX11)])
    if test "${HAVE_XPM}" = "yes"; then
      AC_MSG_CHECKING(for XpmReturnAllocPixels preprocessor define)
      AC_EGREP_CPP(no_return_alloc_pixels,
      [#include "X11/xpm.h"
#ifndef XpmReturnAllocPixels
no_return_alloc_pixels
#endif
      ], HAVE_XPM=no, HAVE_XPM=yes)

      if test "${HAVE_XPM}" = "yes"; then
        AC_MSG_RESULT(yes)
      else
        AC_MSG_RESULT(no)
      fi
    fi
  fi

  if test "${HAVE_XPM}" = "yes"; then
    AC_DEFINE(HAVE_XPM, 1, [Define to 1 if you have the Xpm libary (-lXpm).])
    LIBXPM=-lXpm
  fi
fi
AC_SUBST(LIBXPM)

### Use -ljpeg if available, unless `--with-jpeg=no'.
HAVE_JPEG=no
LIBJPEG=
if test "${HAVE_X11}" = "yes"; then
  if test "${with_jpeg}" != "no"; then
    dnl Checking for jpeglib.h can lose because of a redefinition of
    dnl  HAVE_STDLIB_H.
    AC_CHECK_HEADER(jerror.h,
      [AC_CHECK_LIB(jpeg, jpeg_destroy_compress, HAVE_JPEG=yes)])
  fi

  AH_TEMPLATE(HAVE_JPEG, [Define to 1 if you have the jpeg library (-ljpeg).])dnl
  if test "${HAVE_JPEG}" = "yes"; then
    AC_DEFINE(HAVE_JPEG)
    AC_EGREP_CPP([version= *(6[2-9]|[7-9][0-9])],
        [#include <jpeglib.h>
         version=JPEG_LIB_VERSION
],
        [AC_DEFINE(HAVE_JPEG)],
        [AC_MSG_WARN([libjpeg found, but not version 6b or later])
        HAVE_JPEG=no])
  fi
  if test "${HAVE_JPEG}" = "yes"; then
    LIBJPEG=-ljpeg
  fi
fi
AC_SUBST(LIBJPEG)

### Use -lpng if available, unless `--with-png=no'.
HAVE_PNG=no
LIBPNG=
if test "${HAVE_X11}" = "yes"; then
  if test "${with_png}" != "no"; then
    # Debian unstable as of July 2003 has multiple libpngs, and puts png.h
    # in /usr/include/libpng.
    AC_CHECK_HEADERS(png.h libpng/png.h)
    if test "$ac_cv_header_png_h" = yes || test "$ac_cv_header_libpng_png_h" = yes ; then
      AC_CHECK_LIB(png, png_get_channels, HAVE_PNG=yes, , -lz -lm)
    fi
  fi

  if test "${HAVE_PNG}" = "yes"; then
    AC_DEFINE(HAVE_PNG, 1, [Define to 1 if you have the png library (-lpng).])
    LIBPNG="-lpng -lz -lm"
  fi
fi
AC_SUBST(LIBPNG)

### Use -ltiff if available, unless `--with-tiff=no'.
HAVE_TIFF=no
LIBTIFF=
if test "${HAVE_X11}" = "yes"; then
  if test "${with_tiff}" != "no"; then
    AC_CHECK_HEADER(tiffio.h,
      [tifflibs="-lz -lm"
      # At least one tiff package requires the jpeg library.
      if test "${HAVE_JPEG}" = yes; then tifflibs="-ljpeg $tifflibs"; fi
      AC_CHECK_LIB(tiff, TIFFGetVersion, HAVE_TIFF=yes, , $tifflibs)])
  fi

  if test "${HAVE_TIFF}" = "yes"; then
    AC_DEFINE(HAVE_TIFF, 1, [Define to 1 if you have the tiff library (-ltiff).])
    dnl FIXME -lz -lm, as per libpng?
    LIBTIFF=-ltiff
  fi
fi
AC_SUBST(LIBTIFF)

### Use -lgif or -lungif if available, unless `--with-gif=no'.
HAVE_GIF=no
LIBGIF=
if test "${HAVE_X11}" = "yes" && test "${with_gif}" != "no"; then
  AC_CHECK_HEADER(gif_lib.h,
# EGifPutExtensionLast only exists from version libungif-4.1.0b1.
# Earlier versions can crash Emacs.
    [AC_CHECK_LIB(gif, EGifPutExtensionLast, HAVE_GIF=yes, HAVE_GIF=maybe)])

  if test "$HAVE_GIF" = yes; then
    LIBGIF=-lgif
  elif test "$HAVE_GIF" = maybe; then
# If gif_lib.h but no libgif, try libungif.
    AC_CHECK_LIB(ungif, EGifPutExtensionLast, HAVE_GIF=yes, HAVE_GIF=no)
    test "$HAVE_GIF" = yes && LIBGIF=-lungif
  fi

  if test "${HAVE_GIF}" = "yes"; then
    AC_DEFINE(HAVE_GIF, 1, [Define to 1 if you have a gif (or ungif) library.])
  fi
fi
AC_SUBST(LIBGIF)

dnl Check for required libraries.
if test "${HAVE_X11}" = "yes"; then
  MISSING=""
  WITH_NO=""
  test "${with_xpm}" != "no" && test "${HAVE_XPM}" != "yes" &&
    MISSING="libXpm" && WITH_NO="--with-xpm=no"
  test "${with_jpeg}" != "no" && test "${HAVE_JPEG}" != "yes" &&
    MISSING="$MISSING libjpeg" && WITH_NO="$WITH_NO --with-jpeg=no"
  test "${with_png}" != "no" && test "${HAVE_PNG}" != "yes" &&
    MISSING="$MISSING libpng" && WITH_NO="$WITH_NO --with-png=no"
  test "${with_gif}" != "no" && test "${HAVE_GIF}" != "yes" &&
    MISSING="$MISSING libgif/libungif" && WITH_NO="$WITH_NO --with-gif=no"
  test "${with_tiff}" != "no" && test "${HAVE_TIFF}" != "yes" &&
    MISSING="$MISSING libtiff" && WITH_NO="$WITH_NO --with-tiff=no"

  if test "X${MISSING}" != X; then
    AC_MSG_ERROR([The following required libraries were not found:
    $MISSING
Maybe some development libraries/packages are missing?
If you don't want to link with them give
    $WITH_NO
as options to configure])
  fi
fi

### Use -lgpm if available, unless `--with-gpm=no'.
HAVE_GPM=no
LIBGPM=
MOUSE_SUPPORT=
if test "${with_gpm}" != "no"; then
  AC_CHECK_HEADER(gpm.h,
    [AC_CHECK_LIB(gpm, Gpm_Open, HAVE_GPM=yes)])

  if test "${HAVE_GPM}" = "yes"; then
    AC_DEFINE(HAVE_GPM, 1, [Define to 1 if you have the gpm library (-lgpm).])
    LIBGPM=-lgpm
    ## May be reset below.
    MOUSE_SUPPORT="\$(GPM_MOUSE_SUPPORT)"
  fi
fi
AC_SUBST(LIBGPM)

dnl Check for malloc/malloc.h on darwin
AC_CHECK_HEADER(malloc/malloc.h, [AC_DEFINE(HAVE_MALLOC_MALLOC_H, 1, [Define to 1 if you have the <malloc/malloc.h> header file.])])

C_SWITCH_X_SYSTEM=
### Use NeXTstep API to implement GUI.
if test "${HAVE_NS}" = "yes"; then
  AC_DEFINE(HAVE_NS, 1, [Define to 1 if you are using the NeXTstep API, either GNUstep or Cocoa on Mac OS X.])
  if test "${NS_IMPL_COCOA}" = "yes"; then
    AC_DEFINE(NS_IMPL_COCOA, 1, [Define to 1 if you are using NS windowing under MacOS X.])
    GNU_OBJC_CFLAGS=
  fi
  if test "${NS_IMPL_GNUSTEP}" = "yes"; then
    AC_DEFINE(NS_IMPL_GNUSTEP, 1, [Define to 1 if you are using NS windowing under GNUstep.])
    # See also .m.o rule in Makefile.in */
    # FIXME: are all these flags really needed?  Document here why.  */
    C_SWITCH_X_SYSTEM="-D_REENTRANT -fPIC -fno-strict-aliasing"
    GNU_OBJC_CFLAGS="-fgnu-runtime -Wno-import -fconstant-string-class=NSConstantString -DGNUSTEP_BASE_LIBRARY=1 -DGNU_GUI_LIBRARY=1 -DGNU_RUNTIME=1 -DGSWARN -DGSDIAGNOSE"
  fi
  if test "${NS_HAVE_NSINTEGER}" = "yes"; then
    AC_DEFINE(NS_HAVE_NSINTEGER, 1, [Define to 1 if `NSInteger' is defined.])
  fi
  # We also have mouse menus.
  HAVE_MENUS=yes
  OTHER_FILES=ns-app
fi


### Use session management (-lSM -lICE) if available
HAVE_X_SM=no
LIBXSM=
if test "${HAVE_X11}" = "yes"; then
  AC_CHECK_HEADER(X11/SM/SMlib.h,
    [AC_CHECK_LIB(SM, SmcOpenConnection, HAVE_X_SM=yes, , -lICE)])

  if test "${HAVE_X_SM}" = "yes"; then
    AC_DEFINE(HAVE_X_SM, 1, [Define to 1 if you have the SM library (-lSM).])
    LIBXSM="-lSM -lICE"
    case "$LIBS" in
      *-lSM*) ;;
      *)      LIBS="$LIBXSM $LIBS" ;;
    esac
  fi
fi
AC_SUBST(LIBXSM)

### Use libxml (-lxml2) if available
if test "${with_xml2}" != "no"; then
  ### I'm not sure what the version number should be, so I just guessed.
  PKG_CHECK_MODULES(LIBXML2, libxml-2.0 > 2.2.0, HAVE_LIBXML2=yes, HAVE_LIBXML2=no)
  if test "${HAVE_LIBXML2}" = "yes"; then
    LIBS="$LIBXML2_LIBS $LIBS"
    AC_CHECK_LIB(xml2, htmlReadMemory, HAVE_LIBXML2=yes, HAVE_LIBXML2=no)
    if test "${HAVE_LIBXML2}" = "yes"; then
      AC_DEFINE(HAVE_LIBXML2, 1, [Define to 1 if you have the libxml library (-lxml2).])
    else
      LIBXML2_LIBS=""
      LIBXML2_CFLAGS=""
    fi
  fi
fi
AC_SUBST(LIBXML2_LIBS)
AC_SUBST(LIBXML2_CFLAGS)

# If netdb.h doesn't declare h_errno, we must declare it by hand.
AC_CACHE_CHECK(whether netdb declares h_errno,
               emacs_cv_netdb_declares_h_errno,
[AC_TRY_LINK([#include <netdb.h>],
  [return h_errno;],
  emacs_cv_netdb_declares_h_errno=yes, emacs_cv_netdb_declares_h_errno=no)])
if test $emacs_cv_netdb_declares_h_errno = yes; then
  AC_DEFINE(HAVE_H_ERRNO, 1, [Define to 1 if netdb.h declares h_errno.])
fi

AC_FUNC_ALLOCA

dnl src/alloca.c has been removed.  Could also check if $ALLOCA is set?
dnl FIXME is there an autoconf test that does the right thing, without
dnl needing to call A_M_E afterwards?
if test x"$ac_cv_func_alloca_works" != xyes; then
   AC_MSG_ERROR( [a system implementation of alloca is required] )
fi

# fmod, logb, and frexp are found in -lm on most systems.
# On HPUX 9.01, -lm does not contain logb, so check for sqrt.
AC_CHECK_LIB(m, sqrt)

# Check for mail-locking functions in a "mail" library.  Probably this should
# have the same check as for liblockfile below.
AC_CHECK_LIB(mail, maillock, have_mail=yes, have_mail=no)
if test $have_mail = yes; then
  LIBS_MAIL=-lmail
  LIBS="$LIBS_MAIL $LIBS"
  AC_DEFINE(HAVE_LIBMAIL, 1, [Define to 1 if you have the `mail' library (-lmail).])
else
  LIBS_MAIL=
fi
dnl Debian, at least:
AC_CHECK_LIB(lockfile, maillock, have_lockfile=yes, have_lockfile=no)
if test $have_lockfile = yes; then
   LIBS_MAIL=-llockfile
   LIBS="$LIBS_MAIL $LIBS"
   AC_DEFINE(HAVE_LIBLOCKFILE, 1, [Define to 1 if you have the `lockfile' library (-llockfile).])
else
# If we have the shared liblockfile, assume we must use it for mail
# locking (e.g. Debian).  If we couldn't link against liblockfile
# (no liblockfile.a installed), ensure that we don't need to.
  dnl This works for files generally, not just executables.
  dnl Should we look elsewhere for it?  Maybe examine /etc/ld.so.conf?
  AC_CHECK_PROG(liblockfile, liblockfile.so, yes, no,
                /usr/lib:/lib:/usr/local/lib:$LD_LIBRARY_PATH)
  if test $ac_cv_prog_liblockfile = yes; then
    AC_MSG_ERROR([Shared liblockfile found but can't link against it.
This probably means that movemail could lose mail.
There may be a `development' package to install containing liblockfile.])
  fi
fi
AC_CHECK_FUNCS(touchlock)
AC_CHECK_HEADERS(maillock.h)
AC_SUBST(LIBS_MAIL)

## Define MAIL_USE_FLOCK (or LOCKF) if the mailer uses flock (or lockf) to
## interlock access to the mail spool.  The alternative is a lock file named
## /usr/spool/mail/$USER.lock.
mail_lock=no
case "$opsys" in
  aix4-2) mail_lock="lockf" ;;

  gnu|freebsd|netbsd|openbsd|darwin|irix6-5) mail_lock="flock" ;;

  ## On GNU/Linux systems, both methods are used by various mail programs.
  ## I assume most people are using newer mailers that have heard of flock.
  ## Change this if you need to.
  ## Debian contains a patch which says: ``On Debian/GNU/Linux systems,
  ## configure gets the right answers, and that means *NOT* using flock.
  ## Using flock is guaranteed to be the wrong thing. See Debian Policy
  ## for details.'' and then uses `#ifdef DEBIAN'.  Unfortunately the
  ## Debian maintainer hasn't provided a clean fix for Emacs.
  ## movemail.c will use `maillock' when MAILDIR, HAVE_LIBMAIL and
  ## HAVE_MAILLOCK_H are defined, so the following appears to be the
  ## correct logic.  -- fx
  ## We must check for HAVE_LIBLOCKFILE too, as movemail does.
  ## liblockfile is a Free Software replacement for libmail, used on
  ## Debian systems and elsewhere. -rfr.
  gnu-*)
    mail_lock="flock"
    if test $have_mail = yes || test $have_lockfile = yes; then
      test $ac_cv_header_maillock_h = yes && mail_lock=no
    fi
    ;;
esac

BLESSMAIL_TARGET=
case "$mail_lock" in
  flock) AC_DEFINE(MAIL_USE_FLOCK, 1, [Define if the mailer uses flock to interlock the mail spool.]) ;;

  lockf) AC_DEFINE(MAIL_USE_LOCKF, 1, [Define if the mailer uses lockf to interlock the mail spool.]) ;;

  *) BLESSMAIL_TARGET="need-blessmail" ;;
esac
AC_SUBST(BLESSMAIL_TARGET)


AC_CHECK_FUNCS(gethostname getdomainname dup2 \
rename closedir mkdir rmdir sysinfo getrusage get_current_dir_name \
random lrand48 logb frexp fmod rint cbrt ftime setsid \
strerror fpathconf select mktime euidaccess getpagesize tzset setlocale \
utimes getrlimit setrlimit setpgid getcwd getwd shutdown getaddrinfo \
__fpending mblen mbrlen mbsinit strsignal setitimer ualarm strchr strrchr \
sendto recvfrom getsockopt setsockopt getsockname getpeername \
gai_strerror mkstemp getline getdelim mremap memmove fsync sync \
memset memcmp difftime memcpy mempcpy mblen mbrlen posix_memalign \
cfmakeraw cfsetspeed isnan copysign __executable_start)

AC_CHECK_HEADERS(sys/un.h)

AC_FUNC_MKTIME
if test "$ac_cv_func_working_mktime" = no; then
  AC_DEFINE(BROKEN_MKTIME, 1, [Define to 1 if the mktime function is broken.])
fi

AC_FUNC_GETLOADAVG

AC_FUNC_FSEEKO

# Configure getopt.
m4_include([m4/getopt.m4])
gl_GETOPT_IFELSE([
  gl_GETOPT_SUBSTITUTE_HEADER
  gl_PREREQ_GETOPT
  GETOPTOBJS='getopt.o getopt1.o'
])
AC_SUBST(GETOPTOBJS)

AC_FUNC_GETPGRP

AC_FUNC_STRFTIME

# UNIX98 PTYs.
AC_CHECK_FUNCS(grantpt)

# PTY-related GNU extensions.
AC_CHECK_FUNCS(getpt)

# Check this now, so that we will NOT find the above functions in ncurses.
# That is because we have not set up to link ncurses in lib-src.
# It's better to believe a function is not available
# than to expect to find it in ncurses.
# Also we need tputs and friends to be able to build at all.
have_tputs_et_al=true
AC_SEARCH_LIBS(tputs, [ncurses terminfo termcap], , have_tputs_et_al=false)
if test "$have_tputs_et_al" != true; then
  AC_MSG_ERROR([I couldn't find termcap functions (tputs and friends).
Maybe some development libraries/packages are missing?  Try installing
libncurses-dev(el), libterminfo-dev(el) or similar.])
fi
# Must define this when any termcap library is found.
AC_DEFINE(HAVE_LIBNCURSES, 1,
          [Define to 1 if you have the `ncurses' library (-lncurses).])
## FIXME This was the cpp logic, but I am not sure it is right.
## The above test has not necessarily found libncurses.
HAVE_LIBNCURSES=yes

## Use terminfo instead of termcap?
## Note only system files NOT using terminfo are:
## freebsd < 40000, ms-w32, msdos, netbsd < 599002500, and
## darwin|gnu without ncurses.
TERMINFO=no
LIBS_TERMCAP=
case "$opsys" in
  ## cygwin: Fewer environment variables to go wrong, more terminal types.
  ## hpux10-20: Use the system provided termcap(3) library.
  ## openbsd: David Mazieres <dm@reeducation-labor.lcs.mit.edu> says this
  ##  is necessary.  Otherwise Emacs dumps core when run -nw.
  aix4-2|cygwin|hpux*|irix6-5|openbsd|sol2*|unixware) TERMINFO=yes ;;

  ## darwin: Prevents crashes when running Emacs in Terminal.app under 10.2.
  ##  The ncurses library has been moved out of the System framework in
  ##  Mac OS X 10.2.  So if configure detects it, set the command-line
  ##  option to use it.
  darwin|gnu*)
    ## (HAVE_LIBNCURSES was not always true, but is since 2010-03-18.)
    if test "x$HAVE_LIBNCURSES" = "xyes"; then
      TERMINFO=yes
      LIBS_TERMCAP="-lncurses"
    fi
    ;;

  freebsd)
    AC_MSG_CHECKING([whether FreeBSD is new enough to use terminfo])
    AC_CACHE_VAL(emacs_cv_freebsd_terminfo,
    [AC_TRY_LINK([#include <osreldate.h>],
[#if __FreeBSD_version < 400000
fail;
#endif
], emacs_cv_freebsd_terminfo=yes, emacs_cv_freebsd_terminfo=no)])

    AC_MSG_RESULT($emacs_cv_freebsd_terminfo)

    if test $emacs_cv_freebsd_terminfo = yes; then
      TERMINFO=yes
      LIBS_TERMCAP="-lncurses"
    else
      LIBS_TERMCAP="-ltermcap"
    fi
    ;;

  netbsd)
    if test $ac_cv_search_tputs = -lterminfo; then
      TERMINFO=yes
      LIBS_TERMCAP="-lterminfo"
    else
      LIBS_TERMCAP="-ltermcap"
    fi
    ;;

esac

case "$opsys" in
  ## hpux: Make sure we get select from libc rather than from libcurses
  ##  because libcurses on HPUX 10.10 has a broken version of select.
  ##  We used to use -lc -lcurses, but this may be cleaner.
  hpux*) LIBS_TERMCAP="-ltermcap" ;;

  openbsd) LIBS_TERMCAP="-lncurses" ;;

  ## Must use system termcap, if we use any termcap.  It does special things.
  sol2*) test "$TERMINFO" != yes && LIBS_TERMCAP="-ltermcap" ;;
esac

TERMCAP_OBJ=tparam.o
if test $TERMINFO = yes; then
  AC_DEFINE(TERMINFO, 1, [Define to 1 if you use terminfo instead of termcap.])

  ## Default used to be -ltermcap.  Add a case above if need something else.
  test "x$LIBS_TERMCAP" = "x" && LIBS_TERMCAP="-lcurses"

  TERMCAP_OBJ=terminfo.o
fi
AC_SUBST(LIBS_TERMCAP)
AC_SUBST(TERMCAP_OBJ)


# Do we have res_init, for detecting changes in /etc/resolv.conf?
resolv=no
AC_TRY_LINK([#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>],
    [return res_init();],
    have_res_init=yes, have_res_init=no)
if test "$have_res_init" = no; then
  OLIBS="$LIBS"
  LIBS="$LIBS -lresolv"
  AC_MSG_CHECKING(for res_init with -lresolv)
  AC_TRY_LINK([#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>],
    [return res_init();],
    have_res_init=yes, have_res_init=no)
  AC_MSG_RESULT($have_res_init)
  if test "$have_res_init" = yes ; then
    resolv=yes
  fi
  LIBS="$OLIBS"
fi

if test "$have_res_init" = yes; then
  AC_DEFINE(HAVE_RES_INIT, 1, [Define to 1 if res_init is available.])
fi

# Do we need the Hesiod library to provide the support routines?
LIBHESIOD=
if test "$with_hesiod" != no ; then
  # Don't set $LIBS here -- see comments above.  FIXME which comments?
  AC_CHECK_FUNC(res_send, , [AC_CHECK_FUNC(__res_send, ,
     [AC_CHECK_LIB(resolv, res_send, resolv=yes,
                  [AC_CHECK_LIB(resolv, __res_send, resolv=yes)])])])
  if test "$resolv" = yes ; then
    RESOLVLIB=-lresolv
  else
    RESOLVLIB=
  fi
  AC_CHECK_FUNC(hes_getmailhost, , [AC_CHECK_LIB(hesiod, hes_getmailhost,
        hesiod=yes, :, $RESOLVLIB)])

  if test x"$hesiod" = xyes; then
    AC_DEFINE(HAVE_LIBHESIOD, 1,
              [Define to 1 if you have the hesiod library (-lhesiod).])
    LIBHESIOD=-lhesiod
  fi
fi
AC_SUBST(LIBHESIOD)

# Do we need libresolv (due to res_init or Hesiod)?
if test "$resolv" = yes ; then
  AC_DEFINE(HAVE_LIBRESOLV, 1,
            [Define to 1 if you have the resolv library (-lresolv).])
  LIBRESOLV=-lresolv
else
  LIBRESOLV=
fi
AC_SUBST(LIBRESOLV)

# These tell us which Kerberos-related libraries to use.
COM_ERRLIB=
CRYPTOLIB=
KRB5LIB=
DESLIB=
KRB4LIB=

if test "${with_kerberos}" != no; then
  AC_CHECK_LIB(com_err, com_err, have_com_err=yes, have_com_err=no)
  if test $have_com_err = yes; then
    COM_ERRLIB=-lcom_err
    LIBS="$COM_ERRLIB $LIBS"
    AC_DEFINE(HAVE_LIBCOM_ERR, 1, [Define to 1 if you have the `com_err' library (-lcom_err).])
  fi
  AC_CHECK_LIB(crypto, mit_des_cbc_encrypt, have_crypto=yes, have_crypto=no)
  if test $have_crypto = yes; then
    CRYPTOLIB=-lcrypto
    LIBS="$CRYPTOLIB $LIBS"
    AC_DEFINE(HAVE_LIBCRYPTO, 1, [Define to 1 if you have the `crypto' library (-lcrypto).])
  fi
  AC_CHECK_LIB(k5crypto, mit_des_cbc_encrypt, have_k5crypto=yes, have_k5crypto=no)
  if test $have_k5crypto = yes; then
    CRYPTOLIB=-lk5crypto
    LIBS="$CRYPTOLIB $LIBS"
    AC_DEFINE(HAVE_LIBK5CRYPTO, 1, [Define to 1 if you have the `k5crypto' library (-lk5crypto).])
  fi
  AC_CHECK_LIB(krb5, krb5_init_context, have_krb5=yes, have_krb5=no)
  if test $have_krb5=yes; then
    KRB5LIB=-lkrb5
    LIBS="$KRB5LIB $LIBS"
    AC_DEFINE(HAVE_LIBKRB5, 1, [Define to 1 if you have the `krb5' library (-lkrb5).])
  fi
  dnl FIXME Simplify.  Does not match 22 logic, thanks to default_off?
  if test "${with_kerberos5}" = no; then
    AC_CHECK_LIB(des425, des_cbc_encrypt, have_des425=yes, have_des425=no )
    if test $have_des425 = yes; then
      DESLIB=-ldes425
      LIBS="$DESLIB $LIBS"
      AC_DEFINE(HAVE_LIBDES425, 1, [Define to 1 if you have the `des425' library (-ldes425).])
    else
      AC_CHECK_LIB(des, des_cbc_encrypt, have_des=yes, have_des=no)
      if test $have_des = yes; then
        DESLIB=-ldes
        LIBS="$DESLIB $LIBS"
        AC_DEFINE(HAVE_LIBDES, 1, [Define to 1 if you have the `des' library (-ldes).])
      fi
    fi
    AC_CHECK_LIB(krb4, krb_get_cred, have_krb4=yes, have_krb4=no)
    if test $have_krb4 = yes; then
      KRB4LIB=-lkrb4
      LIBS="$KRB4LIB $LIBS"
      AC_DEFINE(HAVE_LIBKRB4, 1, [Define to 1 if you have the `krb4' library (-lkrb4).])
    else
      AC_CHECK_LIB(krb, krb_get_cred, have_krb=yes, have_krb=no)
      if test $have_krb = yes; then
        KRB4LIB=-lkrb
        LIBS="$KRB4LIB $LIBS"
        AC_DEFINE(HAVE_LIBKRB, 1, [Define to 1 if you have the `krb' library (-lkrb).])
      fi
    fi
  fi

  if test "${with_kerberos5}" != no; then
    AC_CHECK_HEADERS(krb5.h,
      [AC_CHECK_MEMBERS([krb5_error.text, krb5_error.e_text],,,
                        [#include <krb5.h>])])
  else
    AC_CHECK_HEADERS(des.h,,
                     [AC_CHECK_HEADERS(kerberosIV/des.h,,
                                       [AC_CHECK_HEADERS(kerberos/des.h)])])
    AC_CHECK_HEADERS(krb.h,,
                     [AC_CHECK_HEADERS(kerberosIV/krb.h,,
                                       [AC_CHECK_HEADERS(kerberos/krb.h)])])
  fi
  AC_CHECK_HEADERS(com_err.h)
fi

AC_SUBST(COM_ERRLIB)
AC_SUBST(CRYPTOLIB)
AC_SUBST(KRB5LIB)
AC_SUBST(DESLIB)
AC_SUBST(KRB4LIB)

# Solaris requires -lintl if you want strerror (which calls dgettext)
# to return localized messages.
AC_CHECK_LIB(intl, dgettext)

AC_MSG_CHECKING(whether localtime caches TZ)
AC_CACHE_VAL(emacs_cv_localtime_cache,
[if test x$ac_cv_func_tzset = xyes; then
AC_TRY_RUN([#include <time.h>
char TZ_GMT0[] = "TZ=GMT0";
char TZ_PST8[] = "TZ=PST8";
main()
{
  time_t now = time ((time_t *) 0);
  int hour_GMT0, hour_unset;
  if (putenv (TZ_GMT0) != 0)
    exit (1);
  hour_GMT0 = localtime (&now)->tm_hour;
  unsetenv("TZ");
  hour_unset = localtime (&now)->tm_hour;
  if (putenv (TZ_PST8) != 0)
    exit (1);
  if (localtime (&now)->tm_hour == hour_GMT0)
    exit (1);
  unsetenv("TZ");
  if (localtime (&now)->tm_hour != hour_unset)
    exit (1);
  exit (0);
}], emacs_cv_localtime_cache=no, emacs_cv_localtime_cache=yes,
[# If we have tzset, assume the worst when cross-compiling.
emacs_cv_localtime_cache=yes])
else
        # If we lack tzset, report that localtime does not cache TZ,
        # since we can't invalidate the cache if we don't have tzset.
        emacs_cv_localtime_cache=no
fi])dnl
AC_MSG_RESULT($emacs_cv_localtime_cache)
if test $emacs_cv_localtime_cache = yes; then
  AC_DEFINE(LOCALTIME_CACHE, 1,
            [Define to 1 if localtime caches TZ.])
fi

if test "x$HAVE_TIMEVAL" = xyes; then
  AC_CHECK_FUNCS(gettimeofday)
  if test $ac_cv_func_gettimeofday = yes; then
    AC_CACHE_CHECK(whether gettimeofday can accept two arguments,
                   emacs_cv_gettimeofday_two_arguments,
    [AC_TRY_COMPILE([
#ifdef TIME_WITH_SYS_TIME
#include <sys/time.h>
#include <time.h>
#else
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#else
#include <time.h>
#endif
#endif],
      [struct timeval time;
       gettimeofday (&time, 0);],
      emacs_cv_gettimeofday_two_arguments=yes,
      emacs_cv_gettimeofday_two_arguments=no)])
    if test $emacs_cv_gettimeofday_two_arguments = no; then
      AC_DEFINE(GETTIMEOFDAY_ONE_ARGUMENT, 1,
                [Define to 1 if gettimeofday accepts only one argument.])
    fi
  fi
fi

ok_so_far=yes
AC_CHECK_FUNC(socket, , ok_so_far=no)
if test $ok_so_far = yes; then
  AC_CHECK_HEADER(netinet/in.h, , ok_so_far=no)
fi
if test $ok_so_far = yes; then
  AC_CHECK_HEADER(arpa/inet.h, , ok_so_far=no)
fi
if test $ok_so_far = yes; then
dnl Fixme: Not used.  Should this be HAVE_SOCKETS?
  AC_DEFINE(HAVE_INET_SOCKETS, 1,
            [Define to 1 if you have inet sockets.])
fi

AC_CHECK_HEADERS(sys/ioctl.h)

if test -f /usr/lpp/X11/bin/smt.exp; then
  AC_DEFINE(HAVE_AIX_SMT_EXP, 1,
            [Define to 1 if the file /usr/lpp/X11/bin/smt.exp exists.])
fi

AC_MSG_CHECKING(whether system supports dynamic ptys)
if test -d /dev/pts && ls -d /dev/ptmx > /dev/null 2>&1 ; then
  AC_MSG_RESULT(yes)
  AC_DEFINE(HAVE_DEV_PTMX, 1, [Define to 1 if dynamic ptys are supported.])
else
  AC_MSG_RESULT(no)
fi

AC_FUNC_FORK

dnl Adapted from Haible's version.
AC_CACHE_CHECK([for nl_langinfo and CODESET], emacs_cv_langinfo_codeset,
  [AC_TRY_LINK([#include <langinfo.h>],
    [char* cs = nl_langinfo(CODESET);],
    emacs_cv_langinfo_codeset=yes,
    emacs_cv_langinfo_codeset=no)
  ])
if test $emacs_cv_langinfo_codeset = yes; then
  AC_DEFINE(HAVE_LANGINFO_CODESET, 1,
    [Define if you have <langinfo.h> and nl_langinfo(CODESET).])
fi

AC_CHECK_TYPES(size_t)

AC_TYPE_MBSTATE_T

dnl Restrict could probably be used effectively other than in regex.c.
AC_CACHE_CHECK([for C restrict keyword], emacs_cv_c_restrict,
  [AC_TRY_COMPILE([void fred (int *restrict x);], [],
                  emacs_cv_c_restrict=yes,
                  [AC_TRY_COMPILE([void fred (int *__restrict x);], [],
                                  emacs_cv_c_restrict=__restrict,
                                  emacs_cv_c_restrict=no)])])
case "$emacs_cv_c_restrict" in
  yes) emacs_restrict=restrict;;
  no) emacs_restrict="";;
  *) emacs_restrict="$emacs_cv_c_restrict";;
esac
if test "$emacs_restrict" != __restrict; then
  AC_DEFINE_UNQUOTED(__restrict, $emacs_restrict,
    [Define to compiler's equivalent of C99 restrict keyword.
     Don't define if equivalent is `__restrict'.])
fi

AC_CACHE_CHECK([for C restricted array declarations], emacs_cv_c_restrict_arr,
  [AC_TRY_COMPILE([void fred (int x[__restrict]);], [],
                  emacs_cv_c_restrict_arr=yes, emacs_cv_c_restrict_arr=no)])
if test "$emacs_cv_c_restrict_arr" = yes; then
  AC_DEFINE(__restrict_arr, __restrict,
    [Define to compiler's equivalent of C99 restrict keyword in array
     declarations.  Define as empty for no equivalent.])
fi

dnl Fixme: AC_SYS_POSIX_TERMIOS should probably be used, but it's not clear
dnl how the tty code is related to POSIX and/or other versions of termios.
dnl The following looks like a useful start.
dnl
dnl AC_SYS_POSIX_TERMIOS
dnl if test $ac_cv_sys_posix_termios = yes; then
dnl    AC_DEFINE(HAVE_TERMIOS, 1, [Define to 1 if you have POSIX-style functions
dnl                                and macros for terminal control.])
dnl    AC_DEFINE(HAVE_TCATTR, 1, [Define to 1 if you have tcgetattr and tcsetattr.])
dnl fi

dnl Fixme: Use AC_FUNC_MEMCMP since memcmp is used.  (Needs libobj replacement.)

# Set up the CFLAGS for real compilation, so we can substitute it.
CFLAGS="$REAL_CFLAGS"
CPPFLAGS="$REAL_CPPFLAGS"

## Hack to detect a buggy GCC version.
if test "x$GCC" = xyes \
   && test x"`$CC --version 2> /dev/null | grep 'gcc.* 4.5.0'`" != x \
   && test x"`echo $CFLAGS | grep '\-O@<:@23@:>@'`" != x \
   && test x"`echo $CFLAGS | grep '\-fno-optimize-sibling-calls'`" = x; then
   AC_MSG_ERROR([GCC 4.5.0 has problems compiling Emacs; see etc/PROBLEMS'.])
fi

#### Find out which version of Emacs this is.
[version=`grep 'const char emacs_version' ${srcdir}/src/emacs.c \
         | sed -e 's/^[^"]*"\([^"]*\)".*$/\1/'`]
if test x"${version}" = x; then
  AC_MSG_ERROR([can't find current emacs version in `${srcdir}/src/emacs.c'.])
fi
if test x"${version}" != x"$PACKAGE_VERSION"; then
  AC_MSG_WARN([version mismatch between `${srcdir}/configure.in' and `${srcdir}/src/emacs.c'.])
fi

### Specify what sort of things we'll be editing into Makefile and config.h.
### Use configuration here uncanonicalized to avoid exceeding size limits.
AC_SUBST(version)
AC_SUBST(configuration)
## Unused?
AC_SUBST(canonical)
AC_SUBST(srcdir)
AC_SUBST(prefix)
AC_SUBST(exec_prefix)
AC_SUBST(bindir)
AC_SUBST(datadir)
AC_SUBST(sharedstatedir)
AC_SUBST(libexecdir)
AC_SUBST(mandir)
AC_SUBST(infodir)
AC_SUBST(lispdir)
AC_SUBST(locallisppath)
AC_SUBST(lisppath)
AC_SUBST(x_default_search_path)
AC_SUBST(etcdir)
AC_SUBST(archlibdir)
AC_SUBST(docdir)
AC_SUBST(bitmapdir)
AC_SUBST(gamedir)
AC_SUBST(gameuser)
## FIXME? Nothing uses @LD_SWITCH_X_SITE@.
## src/Makefile.in did add LD_SWITCH_X_SITE (as a cpp define) to the
## end of LIBX_BASE, but nothing ever set it.
AC_SUBST(LD_SWITCH_X_SITE)
AC_SUBST(C_SWITCH_X_SITE)
AC_SUBST(C_SWITCH_X_SYSTEM)
AC_SUBST(CFLAGS)
## Used in lwlib/Makefile.in.
AC_SUBST(X_TOOLKIT_TYPE)
AC_SUBST(machfile)
AC_SUBST(opsysfile)
AC_SUBST(GETLOADAVG_LIBS)
AC_SUBST(ns_appdir)
AC_SUBST(ns_appbindir)
AC_SUBST(ns_appresdir)
AC_SUBST(ns_appsrc)
AC_SUBST(GNU_OBJC_CFLAGS)
AC_SUBST(OTHER_FILES)

AC_DEFINE_UNQUOTED(EMACS_CONFIGURATION,  "${canonical}",
                   [Define to the canonical Emacs configuration name.])
AC_DEFINE_UNQUOTED(EMACS_CONFIG_OPTIONS, "${ac_configure_args}",
                   [Define to the options passed to configure.])
AC_DEFINE_UNQUOTED(config_machfile,  "${machfile}",
                   [Define to the used machine dependent file.])
AC_DEFINE_UNQUOTED(config_opsysfile, "${opsysfile}",
                   [Define to the used os dependent file.])

XMENU_OBJ=
XOBJ=
FONT_OBJ=
if test "${HAVE_X_WINDOWS}" = "yes" ; then
  AC_DEFINE(HAVE_X_WINDOWS, 1,
            [Define to 1 if you want to use the X window system.])
  XMENU_OBJ=xmenu.o
  XOBJ="xterm.o xfns.o xselect.o xrdb.o fontset.o xsmfns.o fringe.o image.o xsettings.o xgselect.o"
  FONT_OBJ=xfont.o
  if test "$HAVE_XFT" = "yes"; then
    FONT_OBJ="$FONT_OBJ ftfont.o xftfont.o ftxfont.o"
  elif test "$HAVE_FREETYPE" = "yes"; then
    FONT_OBJ="$FONT_OBJ ftfont.o ftxfont.o"
  fi
  AC_SUBST(FONT_OBJ)
fi
AC_SUBST(XMENU_OBJ)
AC_SUBST(XOBJ)
AC_SUBST(FONT_OBJ)

WIDGET_OBJ=
MOTIF_LIBW=
if test "${USE_X_TOOLKIT}" != "none" ; then
  WIDGET_OBJ=widget.o
  AC_DEFINE(USE_X_TOOLKIT, 1, [Define to 1 if using an X toolkit.])
  if test "${USE_X_TOOLKIT}" = "LUCID"; then
    AC_DEFINE(USE_LUCID, 1, [Define to 1 if using the Lucid X toolkit.])
  elif test "${USE_X_TOOLKIT}" = "MOTIF"; then
    AC_DEFINE(USE_MOTIF, 1, [Define to 1 if using the Motif X toolkit.])
    MOTIF_LIBW=-lXm
    case "$opsys" in
      gnu-linux)
        ## Paul Abrahams <abrahams at equinox.shaysnet.com> says this is needed.
        MOTIF_LIBW="$MOTIF_LIBW -lXpm"
        ;;

      unixware)
        ## Richard Anthony Ryan <ryanr at ellingtn.ftc.nrcs.usda.gov>
        ## says -lXimp is needed in UNIX_SV ... 4.2 1.1.2.
        MOTIF_LIBW="MOTIF_LIBW -lXimp"
        ;;

      aix4-2)
        ## olson@mcs.anl.gov says -li18n is needed by -lXm.
        MOTIF_LIBW="$MOTIF_LIBW -li18n"
        ;;
    esac
    MOTIF_LIBW="$MOTIF_LIBW $LIBXP"
  fi
fi
AC_SUBST(WIDGET_OBJ)

TOOLKIT_LIBW=
case "$USE_X_TOOLKIT" in
  MOTIF) TOOLKIT_LIBW="$MOTIF_LIBW" ;;
  LUCID) TOOLKIT_LIBW="$LUCID_LIBW" ;;
  none) test "x$HAVE_GTK" = "xyes" && TOOLKIT_LIBW="$GTK_LIBS" ;;
esac
AC_SUBST(TOOLKIT_LIBW)

if test "$USE_X_TOOLKIT" = "none"; then
  LIBXT_OTHER="\$(LIBXSM)"
  OLDXMENU_TARGET="really-oldXMenu"
else
  LIBXT_OTHER="\$(LIBXMU) -lXt \$(LIBXTR6) -lXext"
  OLDXMENU_TARGET="really-lwlib"
fi
AC_SUBST(LIBXT_OTHER)

## The X Menu stuff is present in the X10 distribution, but missing
## from X11.  If we have X10, just use the installed library;
## otherwise, use our own copy.
if test "${HAVE_X11}" = "yes" ; then
  AC_DEFINE(HAVE_X11, 1,
            [Define to 1 if you want to use version 11 of X windows.
             Otherwise, Emacs expects to use version 10.])

  if test "$USE_X_TOOLKIT" = "none"; then
    OLDXMENU="\${oldXMenudir}/libXMenu11.a"
  else
    OLDXMENU="\${lwlibdir}/liblw.a"
  fi
  LIBXMENU="\$(OLDXMENU)"
  LIBX_OTHER="\$(LIBXT) \$(LIBX_EXTRA)"
  OLDXMENU_DEPS="\${OLDXMENU} ../src/\${OLDXMENU}"
else
  ## For a syntactically valid Makefile; not actually used for anything.
  ## See comments in src/Makefile.in.
  OLDXMENU=nothing
  ## FIXME This case (!HAVE_X11 && HAVE_X_WINDOWS) is no longer possible(?).
  if test "${HAVE_X_WINDOWS}" = "yes"; then
    LIBXMENU="-lXMenu"
  else
    LIBXMENU=
  fi
  LIBX_OTHER=
  OLDXMENU_DEPS=
fi

if test "$HAVE_GTK" = "yes" || test "$HAVE_MENUS" != "yes"; then
  OLDXMENU_TARGET=
  OLDXMENU=nothing  
  LIBXMENU=
  OLDXMENU_DEPS=
fi

AC_SUBST(OLDXMENU_TARGET)
AC_SUBST(OLDXMENU)
AC_SUBST(LIBXMENU)
AC_SUBST(LIBX_OTHER)
AC_SUBST(OLDXMENU_DEPS)

if test "${HAVE_MENUS}" = "yes" ; then
  AC_DEFINE(HAVE_MENUS, 1,
            [Define to 1 if you have mouse menus.
             (This is automatic if you use X, but the option to specify it remains.)
             It is also defined with other window systems that support xmenu.c.])
fi

if test "${GNU_MALLOC}" = "yes" ; then
  AC_DEFINE(GNU_MALLOC, 1,
            [Define to 1 if you want to use the GNU memory allocator.])
fi

RALLOC_OBJ=
if test "${REL_ALLOC}" = "yes" ; then
  AC_DEFINE(REL_ALLOC, 1,
            [Define REL_ALLOC if you want to use the relocating allocator for
             buffer space.])

  test "$system_malloc" != "yes" && RALLOC_OBJ=ralloc.o
fi
AC_SUBST(RALLOC_OBJ)

if test "$opsys" = "cygwin"; then
  CYGWIN_OBJ="sheap.o"
  ## Cygwin differs because of its unexec().
  PRE_ALLOC_OBJ=
  POST_ALLOC_OBJ=lastfile.o
else
  CYGWIN_OBJ=
  PRE_ALLOC_OBJ=lastfile.o
  POST_ALLOC_OBJ=
fi
AC_SUBST(CYGWIN_OBJ)
AC_SUBST(PRE_ALLOC_OBJ)
AC_SUBST(POST_ALLOC_OBJ)


case "$opsys" in
  aix4-2) LD_SWITCH_SYSTEM_TEMACS="-Wl,-bnodelcsect" ;;

  darwin)
   ## The -headerpad option tells ld (see man page) to leave room at the
   ## end of the header for adding load commands.  Needed for dumping.
   ## 0x690 is the total size of 30 segment load commands (at 56
   ## each); under Cocoa 31 commands are required.
   if test "$HAVE_NS" = "yes"; then
     libs_nsgui="-framework AppKit"
     headerpad_extra=6C8
   else
     libs_nsgui=
     headerpad_extra=690
   fi
   LD_SWITCH_SYSTEM_TEMACS="-prebind $libs_nsgui -Xlinker -headerpad -Xlinker $headerpad_extra"
 
   ## This is here because src/Makefile.in did some extra fiddling around
   ## with LD_SWITCH_SYSTEM.  The cpp logic was:
   ##   #ifndef LD_SWITCH_SYSTEM
   ##   #if !defined (__GNUC__) && ((defined (BSD_SYSTEM) && !defined (COFF)))
   ## Since all the *bsds define LD_SWITCH_SYSTEM, this simplifies to:
   ## not using gcc, darwin system not on an alpha (ie darwin, since
   ## darwin + alpha does not occur).
   ## Because this was done in src/Makefile.in, the resulting part of
   ## LD_SWITCH_SYSTEM was not used in configure (ie, in ac_link).
   ## It therefore seems cleaner to put this in LD_SWITCH_SYSTEM_TEMACS,
   ## rather than LD_SWITCH_SYSTEM.
   test "x$LD_SWITCH_SYSTEM" = "x" && test "x$GCC" != "xyes" && \
     LD_SWITCH_SYSTEM_TEMACS="-X $LD_SWITCH_SYSTEM_TEMACS"
   ;;

  ## LD_SWITCH_X_SITE_AUX is a -R option saying where to find X at run-time.
  ## When handled by cpp, this was in LD_SWITCH_SYSTEM.  However, at
  ## the point where configure sourced the s/*.h file, LD_SWITCH_X_SITE_AUX
  ## had not yet been defined and was expanded to null.  Hence LD_SWITCH_SYSTEM
  ## had different values in configure (in ac_link) and src/Makefile.in.
  ## It seems clearer therefore to put this piece in LD_SWITCH_SYSTEM_TEMACS.
  gnu-linux) LD_SWITCH_SYSTEM_TEMACS="\$(LD_SWITCH_X_SITE_AUX)" ;;

  *) LD_SWITCH_SYSTEM_TEMACS= ;;
esac

if test "$NS_IMPL_GNUSTEP" = "yes"; then
  LD_SWITCH_SYSTEM_TEMACS="${LD_SWITCH_SYSTEM_TEMACS} -L${GNUSTEP_SYSTEM_LIBRARIES} ${GNUSTEP_LOCAL_LIBRARIES} -lgnustep-gui -lgnustep-base -lobjc -lpthread"
fi

AC_SUBST(LD_SWITCH_SYSTEM_TEMACS)


LD_FIRSTFLAG=
ORDINARY_LINK=
case "$opsys" in
  ## gnu: GNU needs its own crt0.
  aix4-2|cygwin|darwin|gnu|hpux*|irix6-5|sol2*|unixware) ORDINARY_LINK=yes ;;

  ## On post 1.3 releases of NetBSD, gcc -nostdlib also clears the
  ## library search parth, i.e. it won't search /usr/lib for libc and
  ## friends.  Using -nostartfiles instead avoids this problem, and
  ## will also work on earlier NetBSD releases.
  netbsd|openbsd) LD_FIRSTFLAG="-nostartfiles" ;;

  ## macpcc: NAKAJI Hiroyuki <nakaji@tutrp.tut.ac.jp> says
  ##   MkLinux/LinuxPPC needs this.
  ## ibms390x only supports opsys = gnu-linux so it can be added here.
  gnu-*)
    case "$machine" in
      macppc|ibms390x) LD_FIRSTFLAG="-nostdlib" ;;
    esac
    ;;
esac


if test "x$ORDINARY_LINK" = "xyes"; then

  LD_FIRSTFLAG=""
  AC_DEFINE(ORDINARY_LINK, 1, [Define if the C compiler is the linker.])

## The system files defining neither ORDINARY_LINK nor LD_FIRSTFLAG are:
## freebsd, gnu-* not on macppc|ibms390x.
elif test "x$GCC" = "xyes" && test "x$LD_FIRSTFLAG" = "x"; then

  ## Versions of GCC >= 2.0 put their library, libgcc.a, in obscure
  ## places that are difficult to figure out at make time.  Fortunately,
  ## these same versions allow you to pass arbitrary flags on to the
  ## linker, so there is no reason not to use it as a linker.
  ##
  ## Well, it is not quite perfect.  The "-nostdlib" keeps GCC from
  ## searching for libraries in its internal directories, so we have to
  ## ask GCC explicitly where to find libgcc.a (LIB_GCC below).
  LD_FIRSTFLAG="-nostdlib"
fi

## FIXME? What setting of EDIT_LDFLAGS should this have?
test "$NS_IMPL_GNUSTEP" = "yes" && LD_FIRSTFLAG="-rdynamic"

AC_SUBST(LD_FIRSTFLAG)


## FIXME? The logic here is not precisely the same as that above.
## There is no check here for a pre-defined LD_FIRSTFLAG.
## Should we only be setting LIB_GCC if LD ~ -nostdlib?
LIB_GCC=
if test "x$GCC" = "xyes" && test "x$ORDINARY_LINK" != "xyes"; then

  case "$opsys" in
    freebsd|netbsd|openbsd) LIB_GCC= ;;

    gnu-*)
      ## armin76@gentoo.org reported that the lgcc_s flag is necessary to
      ## build on ARM EABI under GNU/Linux.  (Bug#5518)
      ## Note that m/arm.h never bothered to undefine LIB_GCC first.
      if test "$machine" = "arm"; then
        LIB_GCC="-lgcc_s"
      else
        ## FIXME? s/gnu-linux.h used to define LIB_GCC as below, then
        ## immediately undefine it again and redefine it to empty.
        ## Was the C_SWITCH_X_SITE part really necessary?
##      LIB_GCC=`$CC $C_SWITCH_X_SITE -print-libgcc-file-name`
        LIB_GCC=
      fi
      ;;

    ## Ask GCC where to find libgcc.a.
    *) LIB_GCC=`$CC -print-libgcc-file-name 2> /dev/null` ;;
  esac
fi                              dnl if $GCC
AC_SUBST(LIB_GCC)


TOOLTIP_SUPPORT=
WINDOW_SUPPORT=
## If we're using X11/GNUstep, define some consequences.
if test "$HAVE_X_WINDOWS" = "yes" || test "$HAVE_NS" = "yes"; then
  AC_DEFINE(HAVE_WINDOW_SYSTEM, 1, [Define if you have a window system.])
  AC_DEFINE(HAVE_MOUSE, 1, [Define if you have mouse support.])
  MOUSE_SUPPORT="\$(REAL_MOUSE_SUPPORT)"
  TOOLTIP_SUPPORT="\${lispsource}/mouse.elc"

  WINDOW_SUPPORT="\$(BASE_WINDOW_SUPPORT)"
  test "$HAVE_X_WINDOWS" = "yes" && \
    WINDOW_SUPPORT="$WINDOW_SUPPORT \$(X_WINDOW_SUPPORT)"

fi
AC_SUBST(MOUSE_SUPPORT)
AC_SUBST(TOOLTIP_SUPPORT)
AC_SUBST(WINDOW_SUPPORT)


AH_TOP([/* GNU Emacs site configuration template file.
   Copyright (C) 1988, 1993, 1994, 1999, 2000, 2001, 2002, 2004, 2005,
     2006, 2007, 2008, 2009, 2010  Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */


/* No code in Emacs #includes config.h twice, but some bits of code
   intended to work with other packages as well (like gmalloc.c)
   think they can include it as many times as they like.  */
#ifndef EMACS_CONFIG_H
#define EMACS_CONFIG_H
])dnl

AH_BOTTOM([
/* Define AMPERSAND_FULL_NAME if you use the convention
   that & in the full name stands for the login id.  */
/* Turned on June 1996 supposing nobody will mind it.  */
#define AMPERSAND_FULL_NAME

/* If using GNU, then support inline function declarations.  */
/* Don't try to switch on inline handling as detected by AC_C_INLINE
   generally, because even if non-gcc compilers accept `inline', they
   may reject `extern inline'.  */
#if defined (__GNUC__) && defined (OPTIMIZE)
#define INLINE __inline__
#else
#define INLINE
#endif

/* `subprocesses' should be defined if you want to
   have code for asynchronous subprocesses
   (as used in M-x compile and M-x shell).
   Only MSDOS does not support this (it overrides
   this in its config_opsysfile below).  */

#define subprocesses

/* Include the os and machine dependent files.  */
#include config_opsysfile
#include config_machfile

/* GNUstep needs a bit more pure memory.  Of the existing knobs,
   SYSTEM_PURESIZE_EXTRA seems like the least likely to cause problems.
  (There is probably a better place to do this, but right now the
   Cocoa side does this in s/darwin.h and we cannot parallel this
   exactly since GNUstep is multi-OS.  */
#if defined HAVE_NS && defined NS_IMPL_GNUSTEP
#  define SYSTEM_PURESIZE_EXTRA 30000
#endif

/* SIGTYPE is the macro we actually use.  */
#ifndef SIGTYPE
#define SIGTYPE RETSIGTYPE
#endif

#ifdef emacs /* Don't do this for lib-src.  */
/* Tell regex.c to use a type compatible with Emacs.  */
#define RE_TRANSLATE_TYPE Lisp_Object
#define RE_TRANSLATE(TBL, C) CHAR_TABLE_TRANSLATE (TBL, C)
#ifdef make_number
/* If make_number is a macro, use it.  */
#define RE_TRANSLATE_P(TBL) (!EQ (TBL, make_number (0)))
#else
/* If make_number is a function, avoid it.  */
#define RE_TRANSLATE_P(TBL) (!(INTEGERP (TBL) && XINT (TBL) == 0))
#endif
#endif

/* Avoid link-time collision with system mktime if we will use our own.  */
#if ! HAVE_MKTIME || BROKEN_MKTIME
#define mktime emacs_mktime
#endif

#define my_strftime nstrftime   /* for strftime.c */

/* These default definitions are good for almost all machines.
   The exceptions override them in m/MACHINE.h.  */

#ifndef BITS_PER_CHAR
#define BITS_PER_CHAR 8
#endif

#ifndef BITS_PER_SHORT
#define BITS_PER_SHORT 16
#endif

/* Note that lisp.h uses this in a preprocessor conditional, so it
   would not work to use sizeof.  That being so, we do all of them
   without sizeof, for uniformity's sake.  */
#ifndef BITS_PER_INT
#define BITS_PER_INT 32
#endif

#ifndef BITS_PER_LONG
#ifdef _LP64
#define BITS_PER_LONG 64
#else
#define BITS_PER_LONG 32
#endif
#endif

/* Define if the compiler supports function prototypes.  It may do so but
   not define __STDC__ (e.g. DEC C by default) or may define it as zero.  */
#undef PROTOTYPES

#include <string.h>
#include <stdlib.h>

#ifdef HAVE_ALLOCA_H
# include <alloca.h>
#elif defined __GNUC__
# define alloca __builtin_alloca
#elif defined _AIX
# define alloca __alloca
#else
# include <stddef.h>
# ifdef  __cplusplus
extern "C"
# endif
void *alloca (size_t);
#endif

#ifndef HAVE_SIZE_T
typedef unsigned size_t;
#endif

#ifndef HAVE_STRCHR
#define strchr(a, b) index (a, b)
#endif

#ifndef HAVE_STRRCHR
#define strrchr(a, b) rindex (a, b)
#endif

#if defined __GNUC__ && (__GNUC__ > 2 \
                         || (__GNUC__ == 2 && __GNUC_MINOR__ >= 5))
#define NO_RETURN       __attribute__ ((__noreturn__))
#else
#define NO_RETURN       /* nothing */
#endif

#if __GNUC__ >= 3  /* On GCC 3.0 we might get a warning.  */
#define NO_INLINE __attribute__((noinline))
#else
#define NO_INLINE
#endif

/* Some versions of GNU/Linux define noinline in their headers.  */
#ifdef noinline
#undef noinline
#endif

/* These won't be used automatically yet.  We also need to know, at least,
   that the stack is continuous.  */
#ifdef __GNUC__
#  ifndef GC_SETJMP_WORKS
  /* GC_SETJMP_WORKS is nearly always appropriate for GCC.  */
#    define GC_SETJMP_WORKS 1
#  endif
#  ifndef GC_LISP_OBJECT_ALIGNMENT
#    define GC_LISP_OBJECT_ALIGNMENT (__alignof__ (Lisp_Object))
#  endif
#endif

#endif /* EMACS_CONFIG_H */

/*
Local Variables:
mode: c
End:
*/
])dnl

#### Report on what we decided to do.
#### Report GTK as a toolkit, even if it doesn't use Xt.
#### It makes printing result more understandable as using GTK sets
#### toolkit_scroll_bars to yes by default.
if test "${HAVE_GTK}" = "yes"; then
  USE_X_TOOLKIT=GTK
fi

echo "
Configured for \`${canonical}'.

  Where should the build process find the source code?    ${srcdir}
  What operating system and machine description files should Emacs use?
        \`${opsysfile}' and \`${machfile}'
  What compiler should emacs be built with?               ${CC} ${CFLAGS}
  Should Emacs use the GNU version of malloc?             ${GNU_MALLOC}${GNU_MALLOC_reason}
  Should Emacs use a relocating allocator for buffers?    ${REL_ALLOC}
  Should Emacs use mmap(2) for buffer allocation?         $use_mmap_for_buffers
  What window system should Emacs use?                    ${window_system}
  What toolkit should Emacs use?                          ${USE_X_TOOLKIT}"

if test -n "${x_includes}"; then
echo "  Where do we find X Windows header files?                ${x_includes}"
else
echo "  Where do we find X Windows header files?                Standard dirs"
fi
if test -n "${x_libraries}"; then
echo "  Where do we find X Windows libraries?                   ${x_libraries}"
else
echo "  Where do we find X Windows libraries?                   Standard dirs"
fi

echo "  Does Emacs use -lXaw3d?                                 ${HAVE_XAW3D}"
echo "  Does Emacs use -lXpm?                                   ${HAVE_XPM}"
echo "  Does Emacs use -ljpeg?                                  ${HAVE_JPEG}"
echo "  Does Emacs use -ltiff?                                  ${HAVE_TIFF}"
echo "  Does Emacs use a gif library?                           ${HAVE_GIF} $LIBGIF"
echo "  Does Emacs use -lpng?                                   ${HAVE_PNG}"
echo "  Does Emacs use -lrsvg-2?                                ${HAVE_RSVG}"
echo "  Does Emacs use imagemagick?                             ${HAVE_IMAGEMAGICK}"

echo "  Does Emacs use -lgpm?                                   ${HAVE_GPM}"
echo "  Does Emacs use -ldbus?                                  ${HAVE_DBUS}"
echo "  Does Emacs use -lgconf?                                 ${HAVE_GCONF}"
echo "  Does Emacs use -lselinux?                               ${HAVE_LIBSELINUX}"
echo "  Does Emacs use -lgnutls?                                ${HAVE_GNUTLS}"
echo "  Does Emacs use -lxml2?                                  ${HAVE_LIBXML2}"

echo "  Does Emacs use -lfreetype?                              ${HAVE_FREETYPE}"
echo "  Does Emacs use -lm17n-flt?                              ${HAVE_M17N_FLT}"
echo "  Does Emacs use -lotf?                                   ${HAVE_LIBOTF}"
echo "  Does Emacs use -lxft?                                   ${HAVE_XFT}"

echo "  Does Emacs use toolkit scroll bars?                     ${USE_TOOLKIT_SCROLL_BARS}"
echo

if test $USE_XASSERTS = yes; then
   echo "  Compiling with asserts turned on."
   CPPFLAGS="$CPPFLAGS -DXASSERTS=1"
fi

echo

if test "$HAVE_NS" = "yes"; then
   echo
   echo "You must run \"make install\" in order to test the built application.
The installed application will go to nextstep/Emacs.app and can be
run or moved from there."
   if test "$EN_NS_SELF_CONTAINED" = "yes"; then
      echo "The application will be fully self-contained."
    else
      echo "The lisp resources for the application will be installed under ${prefix}.
You may need to run \"make install\" with sudo.  The application will fail
to run if these resources are not installed."
   fi
   echo
fi

if test "$HAVE_DBUS" = yes && test "${opsys}" != "gnu-linux"; then
  echo "D-Bus integration has been tested for GNU/Linux only."
  echo
fi


# Remove any trailing slashes in these variables.
[test "${prefix}" != NONE &&
  prefix=`echo "${prefix}" | sed 's,\([^/]\)/*$,\1,'`
test "${exec_prefix}" != NONE &&
  exec_prefix=`echo "${exec_prefix}" | sed 's,\([^/]\)/*$,\1,'`]

dnl You might wonder (I did) why epaths.h is generated by running make,
dnl rather than just letting configure generate it from epaths.in.
dnl One reason is that the various paths are not fully expanded (see above);
dnl eg gamedir=${prefix}/var/games/emacs.
dnl Secondly, the GNU Coding standards require that one should be able
dnl to run `make prefix=/some/where/else' and override the values set
dnl by configure.  This also explains the `move-if-change' test and
dnl the use of force in the `epaths-force' rule in Makefile.in.
AC_OUTPUT(Makefile lib-src/Makefile oldXMenu/Makefile \
        doc/emacs/Makefile doc/misc/Makefile doc/lispintro/Makefile \
        doc/lispref/Makefile src/Makefile \
        lwlib/Makefile lisp/Makefile leim/Makefile, [

### Make the necessary directories, if they don't exist.
for dir in etc lisp ; do
  test -d ${dir} || mkdir ${dir}
done

echo creating src/epaths.h
${MAKE-make} epaths-force

if test ! -f src/.gdbinit && test -f $srcdir/src/.gdbinit; then
  echo creating src/.gdbinit
  echo source $srcdir/src/.gdbinit > src/.gdbinit
fi

], [GCC="$GCC" NON_GNU_CPP="$NON_GNU_CPP" CPP="$CPP" CPPFLAGS="$CPPFLAGS"])