/usr/lib/llvm-3.1/build/autoconf/m4/check_gnu_make.m4 is in llvm-3.1-dev 3.1-2ubuntu1~12.04.1.
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# Check for GNU Make. This is originally from
# http://www.gnu.org/software/ac-archive/htmldoc/check_gnu_make.html
#
AC_DEFUN([AC_CHECK_GNU_MAKE],
[AC_CACHE_CHECK([for GNU make],[llvm_cv_gnu_make_command],
dnl Search all the common names for GNU make
[llvm_cv_gnu_make_command=''
for a in "$MAKE" make gmake gnumake ; do
if test -z "$a" ; then continue ; fi ;
if ( sh -c "$a --version" 2> /dev/null | grep GNU 2>&1 > /dev/null )
then
llvm_cv_gnu_make_command=$a ;
break;
fi
done])
dnl If there was a GNU version, then set @ifGNUmake@ to the empty string,
dnl '#' otherwise
if test "x$llvm_cv_gnu_make_command" != "x" ; then
ifGNUmake='' ;
else
ifGNUmake='#' ;
AC_MSG_RESULT("Not found");
fi
AC_SUBST(ifGNUmake)
])
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