Index: automake.in
===================================================================
--- automake.in.orig	2012-04-13 16:46:00.000000000 +0200
+++ automake.in	2012-04-18 11:35:58.420388812 +0200
@@ -7878,12 +7878,14 @@ sub require_file_internal ($$$@)
       my $fullfile = "$dir/$file";
       my $found_it = 0;
       my $dangling_sym = 0;
+      my $thisdir = dirname ($fullfile);
+      my $thisfile = basename ($fullfile);
 
       if (-l $fullfile && ! -f $fullfile)
 	{
 	  $dangling_sym = 1;
 	}
-      elsif (dir_has_case_matching_file ($dir, $file))
+      elsif (dir_has_case_matching_file ($thisdir, $thisfile))
 	{
 	  $found_it = 1;
 	  maybe_push_required_file ($dir, $file, $fullfile);