Index: src/current/libbif.c
--- src/current/libbif.c.orig
+++ src/current/libbif.c
@@ -27,7 +27,7 @@
 #include <string.h>
 #endif
 
-#if defined(linux) || defined(__DragonFly__) || defined(IOZ_macosx) || defined(__NetBSD__) || defined(Windows)
+#if defined(linux) || defined(__DragonFly__) || defined(IOZ_macosx) || defined(__NetBSD__) || defined(Windows) || defined(__OpenBSD__)
 #include <unistd.h>
 #include <stdlib.h>
 #endif