1 # Check to see how 'make' treats includes. -*- Autoconf -*-
3 # Copyright (C) 2001-2012 Free Software Foundation, Inc.
5 # This file is free software; the Free Software Foundation
6 # gives unlimited permission to copy and/or distribute it,
7 # with or without modifications, as long as this notice is preserved.
11 # Check to see how make treats includes.
12 AC_DEFUN([AM_MAKE_INCLUDE],
14 cat > confinc << 'END'
16 @echo this is the am__doit target
19 # If we don't find an include directive, just comment out the code.
20 AC_MSG_CHECKING([for style of include used by $am_make])
24 # First try GNU make style include.
25 echo "include confinc" > confmf
26 # Ignore all kinds of additional output from 'make'.
27 case `$am_make -s -f confmf 2> /dev/null` in #(
28 *the\ am__doit\ target*)
34 # Now try BSD make style include.
35 if test "$am__include" = "#"; then
36 echo '.include "confinc"' > confmf
37 case `$am_make -s -f confmf 2> /dev/null` in #(
38 *the\ am__doit\ target*)
45 AC_SUBST([am__include])
47 AC_MSG_RESULT([$_am_result])