--- src/vim.h.orig	Wed Jul 29 02:16:07 1998
+++ src/vim.h	Wed Jul 29 02:17:15 1998
@@ -92,7 +92,7 @@
 # include <stdlib.h>
 #endif
 
-#if defined(__FreeBSD__) || defined(__NetBSD__)
+#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
 # include <unistd.h>
 # include <sys/signal.h>
 #endif
@@ -153,7 +153,7 @@
 #endif
 
 #ifdef UNIX
-# if !defined(DOMAIN) && !defined(MACH) && !defined(PureBSD43) && !defined(__FreeBSD__) && !defined(__NetBSD__)
+# if !defined(DOMAIN) && !defined(MACH) && !defined(PureBSD43) && !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__)
 #  ifndef _POSIX_SOURCE
 #   define _POSIX_SOURCE
 #  endif
@@ -191,7 +191,7 @@
 # endif
 #endif
 
-#if defined(UNICOS) || defined(__FreeBSD__) || defined(__NetBSD__)		/* would make sense for other systems too */
+#if defined(UNICOS) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)		/* would make sense for other systems too */
 # include <errno.h>
 #endif