$OpenBSD: patch-configure,v 1.1 2021/02/09 22:13:19 naddy Exp $

Index: configure
--- configure.orig
+++ configure
@@ -350,6 +350,9 @@ case "${ostype}" in
     darwin)
 	defconfigh "_DARWIN_C_SOURCE"
 	;;
+    openbsd)
+	defconfigh "_BSD_SOURCE"
+	;;
     sunos)
 	defconfigh "__EXTENSIONS__"
 	;;
