Replaced all '=' with '$(EQUALS)' for non-assignment operations

bin/mkmf

@@ -467,6 +467,32 @@ if( $suffix eq '.a' ) {
    print MAKEFILE "$opt_p: \$(OBJ) $opt_l\n\t\$(LD) \$(OBJ) -o $opt_p $opt_l \$(LDFLAGS)\n";
 }
 close MAKEFILE;
+
+sub escapeEqualsSign {
+   my $val = shift;
+   $val =~ s/=/\$\(EQUALS\)/g;
+   return $val;
+}
+
+# Make a copy of the completed Makefile, read it back in, escape all `=` signs
+# and write it back out
+rename($mkfile, $mkfile.'.bak');
+open(IN, '<' . $mkfile.'.bak') or die $!;
+open(OUT, '>' . $mkfile) or die $!;
+
+print OUT "EQUALS= =\n";
+
+while(<IN>) {
+  # Only escape ASSIGN_OP lines after assignment
+  if (/^(\S+) = (.*)/) {
+    $_ = "$1 = " .  escapeEqualsSign($2);
+  } else {
+    $_ = escapeEqualsSign($_);
+  }
+  print OUT $_;
+}
+close(IN);
+close(OUT);
 print " $mkfile is ready.\n";
 
 exec 'make', '-f', $mkfile if $opt_x;