--- conf/Makefile.in.orig	Tue Nov 10 13:06:44 2015
+++ conf/Makefile.in	Tue Nov 10 13:08:50 2015
@@ -22,8 +22,8 @@ SHELL=/bin/sh
 
 prefix=@prefix@
 
-SPOOLDIR=$(DESTDIR)@SPOOLDIR@
-CONFDIR=$(DESTDIR)@CONFDIR@
+SPOOLDIR?=$(DESTDIR)@SPOOLDIR@
+CONFDIR?=$(DESTDIR)@CONFDIR@
 
 REAL_SPOOLDIR=@SPOOLDIR@
 REAL_CONFDIR=@CONFDIR@