$OpenBSD: patch-filter_c,v 1.1 2014/09/02 19:17:01 naddy Exp $
--- filter.c.orig	Thu May 25 07:11:41 2000
+++ filter.c	Tue Sep  2 21:02:44 2014
@@ -25,6 +25,7 @@
 
 static FILE* filt_wr;
 static FILE* filt_rd;
+#define pipe2 mypipe2
 static int pipe1[2], pipe2[2];
 static int filter_restarting;
 static int need_to_filter = 0;
