Makefile

--- a/Makefile	Wed Apr 27 00:10:49 2016 -0700
+++ b/Makefile	Wed Apr 27 00:18:18 2016 -0700
@@ -190,6 +190,9 @@
 docker-ubuntu-wily: contrib/docker/ubuntu-wily
 	contrib/dockerdeb ubuntu wily
 
+docker-ubuntu-xenial: contrib/docker/ubuntu-xenial
+	contrib/dockerdeb ubuntu xenial
+
 fedora20:
 	mkdir -p packages/fedora20
 	contrib/buildrpm