diff -Naur gtk-doc-1.11.lunar/gtkdoc-common.pl.in gtk-doc-1.11/gtkdoc-common.pl.in
--- gtk-doc-1.11.lunar/gtkdoc-common.pl.in	2008-09-10 18:17:57.000000000 +0200
+++ gtk-doc-1.11/gtkdoc-common.pl.in	2009-03-23 19:14:31.000000000 +0100
@@ -51,7 +51,7 @@
     my $exit_code = 1;
 
     if (-e $old_file) {
-	`cmp -s $old_file $new_file`;
+	`cmp -s "$old_file" "$new_file"`;
 	$exit_code = $? >> 8;
 #	print "   cmp exit code: $exit_code ($?)\n";
     }