Index: packages/clib/nonblockio.c
--- packages/clib/nonblockio.c.orig
+++ packages/clib/nonblockio.c
@@ -180,7 +180,7 @@ typedef size_t os_bufsize_t;
 #ifndef s6_addr16
 #if defined(s6_words)
 #define s6_addr16 s6_words
-#elif defined(__APPLE__) || defined(__FreeBSD__)
+#elif defined(__APPLE__) || defined(__FreeBSD__) || defined(__OpenBSD__)
 #define s6_addr16 __u6_addr.__u6_addr16
 #endif
 #endif
