$OpenBSD: patch-Makefile,v 1.2 2011/07/08 09:52:50 jasper Exp $
--- Makefile.orig	Wed Sep 16 21:56:29 1998
+++ Makefile	Fri Jul  8 11:46:48 2011
@@ -1,7 +1,7 @@
-all:	idiff
+CFLAGS += -g
 
-idiff:	idiff.c
-	$(CC) idiff.c -o idiff
+PROG = idiff
 
-clean:
-	rm -f *.o a.out
+all:	idiff
+
+.include <bsd.prog.mk>