--- Makefile.in.orig	2013-11-08 22:45:17.000000000 +0800
+++ Makefile.in	2013-11-08 22:46:17.000000000 +0800
@@ -1,5 +1,5 @@
 # this was NOT generated by automake.
-PREFIX=@prefix@
+PREFIX=${DESTDIR}@prefix@
 BINDIR=${PREFIX}/bin
 LIBDIR=${PREFIX}/lib
 MANDIR=@mandir@