$OpenBSD: patch-src_3rdparty_forkfd_forkfd_c,v 1.2 2017/10/24 10:12:19 rsadowski Exp $
Unbreak build.
Index: src/3rdparty/forkfd/forkfd.c
--- src/3rdparty/forkfd/forkfd.c.orig
+++ src/3rdparty/forkfd/forkfd.c
@@ -63,7 +63,7 @@
 #  include <sys/procdesc.h>
 #endif
 
-#if _POSIX_VERSION-0 >= 200809L || _XOPEN_VERSION-0 >= 500
+#if (_POSIX_VERSION-0 >= 200809L || _XOPEN_VERSION-0 >= 500) && !defined(__OpenBSD__)
 #  define HAVE_WAITID   1
 #endif
 #if !defined(WEXITED) || !defined(WNOWAIT)
