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.
13 # Check to see how make treats includes.
14 AC_DEFUN([AM_MAKE_INCLUDE],
16 cat > confinc << 'END'
18 @echo this is the am__doit target
21 # If we don't find an include directive, just comment out the code.
22 AC_MSG_CHECKING([for style of include used by $am_make])
26 # First try GNU make style include.
27 echo "include confinc" > confmf
28 # Ignore all kinds of additional output from 'make'.
29 case `$am_make -s -f confmf 2> /dev/null` in #(
30 *the\ am__doit\ target*)
36 # Now try BSD make style include.
37 if test "$am__include" = "#"; then
38 echo '.include "confinc"' > confmf
39 case `$am_make -s -f confmf 2> /dev/null` in #(
40 *the\ am__doit\ target*)
47 AC_SUBST([am__include])
49 AC_MSG_RESULT([$_am_result])