enforce minimum m4 version (1.4.16)

This commit was SVN r27603.

autogen.pl

@@ -57,12 +57,14 @@ my $ompi_automake_version = "1.11.1";
 my $ompi_autoconf_version = "2.65";
 my $ompi_libtool_version = "2.2.6b";
 my $ompi_flex_version = "2.5.35";
+my $ompi_m4_version = "1.4.16";
 
 # Search paths
 my $ompi_autoconf_search = "autoconf";
 my $ompi_automake_search = "automake";
 my $ompi_libtoolize_search = "libtoolize;glibtoolize";
 my $ompi_flex_search = "flex";
+my $ompi_m4_search = "m4;gm4";
 
 # One-time setup
 my $username;
@@ -799,6 +801,7 @@ GNU tools:
     GNU Autoconf: $ompi_autoconf_version
     GNU Automake: $ompi_automake_version
     GNU Libtool: $ompi_libtool_version
+    GNU M4: $ompi_m4_version
     Flex: $ompi_flex_version
 =================================================================\n";
     my_exit(1);
@@ -1019,6 +1022,7 @@ $step. Checking tool versions\n\n";
 &find_and_check("libtool", $ompi_libtoolize_search, $ompi_libtool_version);
 &find_and_check("automake", $ompi_automake_search, $ompi_automake_version);
 &find_and_check("flex", $ompi_flex_search, $ompi_flex_version);
+&find_and_check("m4", $ompi_m4_search, $ompi_m4_version);
 
 #---------------------------------------------------------------------------