Avoid `configure' issues with symbolic links.

Based on a patch from Alexander Stohr <Alexander.Stohr@gmx.de>.

* configure: Compare directories using `ls -id'.
Check existence of `reference' subdirectory before creating it.

ChangeLog

@@ -1,3 +1,11 @@
+2010-10-03  Werner Lemberg  <wl@gnu.org>
+
+	Avoid `configure' issues with symbolic links.
+	Based on a patch from Alexander Stohr <Alexander.Stohr@gmx.de>.
+
+	* configure: Compare directories using `ls -id'.
+	Check existence of `reference' subdirectory before creating it.
+
 2010-10-02  Werner Lemberg  <wl@gnu.org>
 
 	Fix Savannah bug #31088 (sort of).

configure

@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# Copyright 2002, 2003, 2004, 2005, 2006, 2008, 2009 by
+# Copyright 2002, 2003, 2004, 2005, 2006, 2008, 2009, 2010 by
 # David Turner, Robert Wilhelm, and Werner Lemberg.
 #
 # This file is part of the FreeType project, and may only be used, modified,
@@ -78,10 +78,15 @@ if test $# -gt 0; then
   done
 fi
 
-# build a dummy Makefile if we are not building in the source tree
+# build a dummy Makefile if we are not building in the source tree;
+# we use inodes to avoid issues with symbolic links
+inode_src=`ls -id $abs_ft2_dir | sed 's/ .*//'`
+inode_dst=`ls -id $abs_curr_dir | sed 's/ .*//'`
 
-if test "$abs_curr_dir" != "$abs_ft2_dir"; then
-  mkdir reference
+if test $inode_src -ne $inode_dst; then
+  if test ! -d reference; then
+    mkdir reference
+  fi
   if test ! -r $abs_curr_dir/modules.cfg; then
     echo "Copying \`modules.cfg'"
     cp $abs_ft2_dir/modules.cfg $abs_curr_dir