From c28ba6ef0bfc8f76c156b92b5c0acfdf1df13fcf Mon Sep 17 00:00:00 2001
From: Wesley Aptekar-Cassels <me@wesleyac.com>
Date: Thu, 28 Sep 2023 18:29:32 -0400
Subject: Don't allow building without setting board color.

Fixes: #288
---
 make.mk | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/make.mk b/make.mk
index a83108bd..31189c8f 100644
--- a/make.mk
+++ b/make.mk
@@ -207,6 +207,10 @@ ifeq ($(LED), BLUE)
 CFLAGS += -DWATCH_IS_BLUE_BOARD
 endif
 
+ifndef COLOR
+$(error Set the COLOR variable to RED, BLUE, or GREEN depending on what board you have.)
+endif
+
 ifeq ($(COLOR), BLUE)
 CFLAGS += -DWATCH_IS_BLUE_BOARD
 endif
-- 
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