Merge pull request #292 from WesleyAC/error-when-no-color

Don't allow building without setting board color.

.github/workflows/build.yml

@@ -6,6 +6,9 @@ on:
     branches-ignore:
       - gh-pages
 
+env:
+  COLOR: BLUE
+
 jobs: 
   build:
     container:

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