-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