--- 20_memtest86+.orig	2009-06-07 23:16:17.000000000 +0100
+++ /etc/grub.d/20_memtest86+	2009-06-07 23:21:32.000000000 +0100
@@ -1,7 +1,12 @@
 #!/bin/sh
 set -e
 
-. /usr/lib/grub/update-grub_lib
+prefix=/usr
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib
+
+. ${libdir}/grub/grub-mkconfig_lib
+
 if test -e /boot/memtest86+.bin ; then
   MEMTESTPATH=$( make_system_path_relative_to_its_root "/boot/memtest86+.bin" )
   echo "Found memtest86+ image: $MEMTESTPATH" >&2