--- src/unexec.c.orig	Wed Dec 18 23:44:05 1996
+++ src/unexec.c	Mon May  4 12:55:15 1998
@@ -294,11 +294,11 @@
 #ifndef HPUX
 /* not sure where this for NetBSD should really go
    and it probably applies to other systems */
-#if !defined(__NetBSD__) && !defined(__bsdi__)
+#if !defined(__NetBSD__) && !defined(__bsdi__) && !defined(__OpenBSD__)
 extern void *sbrk (ptrdiff_t);
 #else
 extern char *sbrk ();
-#endif /* __NetBSD__ */
+#endif /* __NetBSD__ or __OpenBSD__ */
 #endif /* HPUX */
 #else
 extern void *sbrk ();
