diff -Naur a/configure.ac b/configure.ac
--- a/configure.ac	2008-04-14 17:40:54.000000000 +0200
+++ b/configure.ac	2008-04-14 17:42:49.000000000 +0200
@@ -1962,7 +1962,9 @@
 
 AC_SUBST([DIX_CFLAGS])
 
-AC_SUBST([libdir exec_prefix prefix])
+AC_SUBST([libdir])
+AC_SUBST([exec_prefix])
+AC_SUBST([prefix])
 
 # Man page sections - used in config utils & generating man pages
 XORG_MANPAGE_SECTIONS