From 29f5515959de45a7f2971756e3563995c425c2c2 Mon Sep 17 00:00:00 2001
From: Jeremy Benoist <jeremy.benoist@gmail.com>
Date: Mon, 13 Jan 2020 15:58:59 +0100
Subject: [PATCH] Improve check by using list

See https://stackoverflow.com/a/27335439/569101
---
 GNUmakefile | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/GNUmakefile b/GNUmakefile
index db87c5d2..837f7103 100755
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -3,12 +3,9 @@ TMP_FOLDER=/tmp
 RELEASE_FOLDER=wllbg-release
 
 # ensure the ENV variable is well defined
-ifeq ($(origin ENV), prod)
-	# all good ("prod" is a valid env)
-else ifeq ($(origin ENV), dev)
-	# all good ("dev" is a valid env)
-else ifeq ($(origin ENV), test)
-	# all good ("test" is a valid env)
+AVAILABLE_ENV := prod dev test
+ifneq ($(filter $(ENV),$(AVAILABLE_ENV)),)
+	# all good
 else
 	# not good, force it to "prod"
 	override ENV = prod
-- 
2.41.0