define SRC_LANG_RULE =
$(if $($1),,$(eval $1 := t)\
$(eval MOD := $(filter $(MODULES),$(firstword $(subst /, ,$(dir $1)))))\
-$(eval FLG := $($2_FLAGS) $(MOD:%=-I% ))\
+$(eval FLG := $(MOD:%=-I% ))\
$(if $(wildcard $1),
$(eval DEPS := $(filter-out \ %:,$(shell $($2_C) $(FLG) -M -MG $1)))\
$(eval MDEPS := $(filter $(MODULES:%=%/%),$(DEPS)))\