build: Insist on m4 being installed.

[paraslash.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index 5960b0871ec7fc720bef13a90d9af5a58dd75e10..2e4b42ceb064ada1fceda9cfbf88ac5f15685ea8 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -71,6 +71,10 @@ AC_PATH_PROG([GENGETOPT], [gengetopt])
 test -z "$GENGETOPT" && AC_MSG_ERROR(
        [gengetopt is required to build this package])
 
+AC_PATH_PROG([M4], [m4])
+test -z "$M4" && AC_MSG_ERROR(
+       [The m4 macro processor is required to build this package])
+
 AC_PATH_PROG([HELP2MAN], [help2man])
 test -z "$HELP2MAN" && AC_MSG_ERROR(
        [help2man is required to build this package])