asterisk/autoconf/ast_check_gnu_make.m4

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AC_DEFUN([AST_CHECK_GNU_MAKE], [AC_CACHE_CHECK([for GNU make], [ac_cv_GNU_MAKE],
ac_cv_GNU_MAKE='Not Found' ;
ac_cv_GNU_MAKE_VERSION_MAJOR=0 ;
ac_cv_GNU_MAKE_VERSION_MINOR=0 ;
for a in make gmake gnumake ; do
if test -z "$a" ; then continue ; fi ;
if ( sh -c "$a --version" 2> /dev/null | grep GNU 2>&1 > /dev/null ) ; then
ac_cv_GNU_MAKE=$a ;
ac_cv_GNU_MAKE_VERSION_MAJOR=`$ac_cv_GNU_MAKE --version | grep "GNU Make" | cut -f3 -d' ' | cut -f1 -d'.'`
ac_cv_GNU_MAKE_VERSION_MINOR=`$ac_cv_GNU_MAKE --version | grep "GNU Make" | cut -f2 -d'.' | cut -c1-2`
break;
fi
done ;
) ;
if test "x$ac_cv_GNU_MAKE" = "xNot Found" ; then
AC_MSG_ERROR( *** Please install GNU make. It is required to build Asterisk!)
exit 1
fi
AC_SUBST([GNU_MAKE], [$ac_cv_GNU_MAKE])
])