diff --git a/mach/pdp/libpc/Makefile b/mach/pdp/libpc/Makefile
index 8e632c776..c5446b4f6 100644
--- a/mach/pdp/libpc/Makefile
+++ b/mach/pdp/libpc/Makefile
@@ -1,15 +1,14 @@
 MAKEFILE=../../proto/libg/Makefile
 MACHDEF="MACH=pdp -Rbe-p2" "SUF=o" "ASAR=ar"
 PCDEF="PREF=pc" "SUB=" "SRC=lang/pc/libpc"
-LIBDIR=../lib
 
 install:
 	make -f $(MAKEFILE) $(PCDEF) $(MACHDEF) cp
 
 cmp:
 	make -f $(MAKEFILE) $(PCDEF) $(MACHDEF) all
-	cmp head_pc $(LIBDIR)/head_pc
-	cmp tail_pc $(LIBDIR)/tail_pc
+	-../../compare head_pc
+	-../../compare tail_pc
 
 clean:
 		-rm -f *.old *.[ce$(SUF)] tail* head*