diff -up splix/module.mk.custom-ppd-dir splix/module.mk
--- splix/module.mk.custom-ppd-dir	2011-07-20 18:20:18.000000000 +0200
+++ splix/module.mk	2011-11-30 17:05:22.909275151 +0100
@@ -55,7 +55,7 @@ endif
 
 # Get some information
 CUPSFILTER		:= `cups-config --serverbin`/filter
-CUPSPPD			:= `cups-config --datadir`/model
+CUPSPPD			?= `cups-config --datadir`/model
 ifeq ($(ARCHI),Darwin)
 PSTORASTER		:= pstocupsraster
 else