diff --git a/make/defs-orig.mk b/make/defs-orig.mk
index 395c9dec..0e090306 100644
--- a/make/defs-orig.mk
+++ b/make/defs-orig.mk
@@ -48,8 +48,8 @@ LOCAL_C     = $(wildcard *.c)
 LOCAL_CPP   = $(wildcard *.c *.cpp *.cc *.C)
 LOCAL_CSRC  = $(LOCAL_H) $(LOCAL_C) $(LOCAL_CPP)
 
-PREREQ_DIR  = $(patsubst %,$(MODDIR)/%,$(LOCAL_PREREQ))
-PREREQ_DONE = $(patsubst %,%/all.done,$(PREREQ_DIR))
+PREREQ_DIR  = $(addprefix $(MODDIR)/,$(LOCAL_PREREQ))
+PREREQ_DONE = $(addsuffix /all.done,$(PREREQ_DIR))
 PREREQ_H    = $(foreach dir,$(PREREQ_DIR),$(wildcard $(dir)/*.h))  
 PREREQ_C    = $(foreach dir,$(PREREQ_DIR),$(wildcard $(dir)/*.c)) 
 PREREQ_CPP  = $(foreach dir,$(PREREQ_DIR),$(wildcard $(dir)/*.c)) \