NetBSD/gnu/dist/autoconf/m4/m4.m4

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# AC_PROG_GNU_M4
# --------------
# Check for GNU m4, at least 1.3 (supports frozen files).
AC_DEFUN([AC_PROG_GNU_M4],
[AC_PATH_PROGS(M4, gm4 gnum4 m4, m4)
AC_CACHE_CHECK(whether m4 supports frozen files, ac_cv_prog_gnu_m4,
[ac_cv_prog_gnu_m4=no
if test x"$M4" != x; then
case `$M4 --help < /dev/null 2>&1` in
*reload-state*) ac_cv_prog_gnu_m4=yes ;;
esac
fi])])