--- src/mem-limits.h.orig	Mon Jul  7 02:54:11 1997
+++ src/mem-limits.h	Mon May  4 12:48:02 1998
@@ -54,7 +54,7 @@
 #include <sys/resource.h>
 #endif
 
-#if defined(__bsdi__) || defined(__NetBSD__)
+#if defined(__bsdi__) || defined(__NetBSD__) || defined(__OpenBSD__)
 #define BSD4_2
 #endif
 
