-# Every directory with .c files is included.
-DIRS=$(filter-out $(foreach d,$(EXCLUDE),ccan/$d), $(patsubst %/, %, $(sort $(dir $(wildcard ccan/*/*.c)))))
+# Anything with C files needs building; dir leaves / on, sort uniquifies
+DIRS=$(patsubst %/, %, $(sort $(foreach m, $(filter-out $(MODS_EXCLUDE), $(MODS_WITH_SRC)), $(dir $(wildcard ccan/$m/*.c)))))