4 These are generic installation instructions.
6 The `configure' shell script attempts to guess correct values for
7 various system-dependent variables used during compilation. It uses
8 those values to create a `Makefile' in each directory of the package.
9 It may also create one or more `.h' files containing system-dependent
10 definitions. Finally, it creates a shell script `config.status' that
11 you can run in the future to recreate the current configuration, and a
12 file `config.log' containing compiler output (useful mainly for
13 debugging `configure').
15 It can also use an optional file (typically called `config.cache'
16 and enabled with `--cache-file=config.cache' or simply `-C') that saves
17 the results of its tests to speed up reconfiguring. (Caching is
18 disabled by default to prevent problems with accidental use of stale
21 If you need to do unusual things to compile the package, please try
22 to figure out how `configure' could check whether to do them, and mail
23 diffs or instructions to the address given in the `README' so they can
24 be considered for the next release. If you are using the cache, and at
25 some point `config.cache' contains results you don't want to keep, you
26 may remove or edit it.
28 The file `configure.in' is used to create `configure' by a program
29 called `autoconf'. You only need `configure.in' if you want to change
30 it or regenerate `configure' using a newer version of `autoconf'.
32 The simplest way to compile this package is:
34 1. `cd' to the directory containing the package's source code and type
35 `./configure' to configure the package for your system. If you're
36 using `csh' on an old version of System V, you might need to type
37 `sh ./configure' instead to prevent `csh' from trying to execute
40 Running `configure' takes awhile. While running, it prints some
41 messages telling which features it is checking for.
43 2. Type `make' to compile the package.
45 3. Optionally, type `make check' to run any self-tests that come with
48 4. Type `make install' to install the programs and any data files and
51 5. You can remove the program binaries and object files from the
52 source code directory by typing `make clean'. To also remove the
53 files that `configure' created (so you can compile the package for
54 a different kind of computer), type `make distclean'. There is
55 also a `make maintainer-clean' target, but that is intended mainly
56 for the package's developers. If you use it, you may have to get
57 all sorts of other programs in order to regenerate files that came
58 with the distribution.
63 Some systems require unusual options for compilation or linking that
64 the `configure' script does not know about. Run `./configure --help'
65 for details on some of the pertinent environment variables.
67 You can give `configure' initial values for variables by setting
68 them in the environment. You can do that on the command line like this:
70 ./configure CC=c89 CFLAGS=-O2 LIBS=-lposix
72 *Note Environment Variables::, for more details.
74 Compiling For Multiple Architectures
75 ====================================
77 You can compile the package for more than one kind of computer at the
78 same time, by placing the object files for each architecture in their
79 own directory. To do this, you must use a version of `make' that
80 supports the `VPATH' variable, such as GNU `make'. `cd' to the
81 directory where you want the object files and executables to go and run
82 the `configure' script. `configure' automatically checks for the
83 source code in the directory that `configure' is in and in `..'.
85 If you have to use a `make' that does not support the `VPATH'
86 variable, you have to compile the package for one architecture at a time
87 in the source code directory. After you have installed the package for
88 one architecture, use `make distclean' before reconfiguring for another
94 By default, `make install' will install the package's files in
95 `/usr/local/bin', `/usr/local/man', etc. You can specify an
96 installation prefix other than `/usr/local' by giving `configure' the
97 option `--prefix=PATH'.
99 You can specify separate installation prefixes for
100 architecture-specific files and architecture-independent files. If you
101 give `configure' the option `--exec-prefix=PATH', the package will use
102 PATH as the prefix for installing programs and libraries.
103 Documentation and other data files will still use the regular prefix.
105 In addition, if you use an unusual directory layout you can give
106 options like `--bindir=PATH' to specify different values for particular
107 kinds of files. Run `configure --help' for a list of the directories
108 you can set and what kinds of files go in them.
110 If the package supports it, you can cause programs to be installed
111 with an extra prefix or suffix on their names by giving `configure' the
112 option `--program-prefix=PREFIX' or `--program-suffix=SUFFIX'.
117 Some packages pay attention to `--enable-FEATURE' options to
118 `configure', where FEATURE indicates an optional part of the package.
119 They may also pay attention to `--with-PACKAGE' options, where PACKAGE
120 is something like `gnu-as' or `x' (for the X Window System). The
121 `README' should mention any `--enable-' and `--with-' options that the
124 For packages that use the X Window System, `configure' can usually
125 find the X include and library files automatically, but if it doesn't,
126 you can use the `configure' options `--x-includes=DIR' and
127 `--x-libraries=DIR' to specify their locations.
129 Specifying the System Type
130 ==========================
132 There may be some features `configure' cannot figure out
133 automatically, but needs to determine by the type of host the package
134 will run on. Usually `configure' can figure that out, but if it prints
135 a message saying it cannot guess the host type, give it the
136 `--build=TYPE' option. TYPE can either be a short name for the system
137 type, such as `sun4', or a canonical name which has the form:
141 where SYSTEM can have one of these forms:
146 See the file `config.sub' for the possible values of each field. If
147 `config.sub' isn't included in this package, then this package doesn't
148 need to know the host type.
150 If you are _building_ compiler tools for cross-compiling, you should
151 use the `--target=TYPE' option to select the type of system they will
154 If you want to _use_ a cross compiler, that generates code for a
155 platform different from the build platform, you should specify the host
156 platform (i.e., that on which the generated programs will eventually be
157 run) with `--host=TYPE'. In this case, you should also specify the
158 build platform with `--build=TYPE', because, in this case, it may not
159 be possible to guess the build platform (it sometimes involves
160 compiling and running simple test programs, and this can't be done if
161 the compiler is a cross compiler).
166 If you want to set default values for `configure' scripts to share,
167 you can create a site shell script called `config.site' that gives
168 default values for variables like `CC', `cache_file', and `prefix'.
169 `configure' looks for `PREFIX/share/config.site' if it exists, then
170 `PREFIX/etc/config.site' if it exists. Or, you can set the
171 `CONFIG_SITE' environment variable to the location of the site script.
172 A warning: not all `configure' scripts look for a site script.
174 Environment Variables
175 =====================
177 Variables not defined in a site shell script can be set in the
178 environment passed to configure. However, some packages may run
179 configure again during the build, and the customized values of these
180 variables may be lost. In order to avoid this problem, you should set
181 them in the `configure' command line, using `VAR=value'. For example:
183 ./configure CC=/usr/local2/bin/gcc
185 will cause the specified gcc to be used as the C compiler (unless it is
186 overridden in the site shell script).
188 `configure' Invocation
189 ======================
191 `configure' recognizes the following options to control how it
196 Print a summary of the options to `configure', and exit.
200 Print the version of Autoconf used to generate the `configure'
204 Enable the cache: use and save the results of the tests in FILE,
205 traditionally `config.cache'. FILE defaults to `/dev/null' to
210 Alias for `--cache-file=config.cache'.
215 Do not print messages saying which checks are being made. To
216 suppress all normal output, redirect it to `/dev/null' (any error
217 messages will still be shown).
220 Look for the package's source code in directory DIR. Usually
221 `configure' can determine that directory automatically.
223 `configure' also accepts some other, not widely useful, options. Run
224 `configure --help' for more details.