diff --git a/tools/build/options/WITH_NETLINK_SUPPORT b/tools/build/options/WITH_NETLINK_SUPPORT
new file mode 100644
--- /dev/null
+++ b/tools/build/options/WITH_NETLINK_SUPPORT
@@ -0,0 +1,5 @@
+.\" $FreeBSD$
+Make libraries and programs use
+.Xr snl 3
+interfaces instead of rtsock and
+.Xr sysctl 3 .