ifeq ($(config),undef)
config += $(foreach app,$(AVAILABLE_APPS),$(if $(findstring $(CONFIG_$(app)),y yes t true Y YES T TRUE),$(app)))
endif
ifeq ($(config),undef)
config += $(foreach app,$(AVAILABLE_APPS),$(if $(findstring $(CONFIG_$(app)),y yes t true Y YES T TRUE),$(app)))
endif