From 3e2da4e3853c443b3aa5644dbc3a33a390ac272a Mon Sep 17 00:00:00 2001
From: Wolfgang Hottgenroth <w.hottgenroth@krohne.com>
Date: Tue, 16 Feb 2021 11:51:43 +0100
Subject: [PATCH] nal

---
 cube/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/cube/Makefile b/cube/Makefile
index 64a0839..86d0882 100644
--- a/cube/Makefile
+++ b/cube/Makefile
@@ -22,6 +22,9 @@
 
 # NETWORK = LAN
 
+ifndef NETWORK
+$(error NETWORK is not set)
+endif
 
 ######################################
 # target