# serial 1 # BISON_AC_PROG_GNU_M4 # -------------------- # Check for GNU m4, at least 1.3 (supports frozen files). AC_DEFUN([BISON_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])])