--- config.mk.in.orig	2012-09-06 15:37:58.253921955 +0800
+++ config.mk.in	2012-09-06 15:38:09.939751074 +0800
@@ -2,7 +2,7 @@
 PACKAGE_TARNAME := @PACKAGE_TARNAME@
 PACKAGE_VERSION := @PACKAGE_VERSION@
 
-abs_top_srcdir := @abs_top_srcdir@
+abs_top_srcdir := $(realpath @abs_top_srcdir@)
 prefix := @prefix@
 exec_prefix := @exec_prefix@
 bindir := @bindir@