--- mem_config.in.orig	2016-10-05 10:25:33 UTC
+++ mem_config.in
@@ -417,6 +417,9 @@
 /* OS of Build System */
 #undef HOST_OS
 
+/* Whether we are building for BSDSUniX */
+#undef HOST_OS_BSDSUNIX
+
 /* Whether we are building for FreeBSD */
 #undef HOST_OS_FREEBSD