-# Every directory with .c files is included.
-DIRS=$(filter-out $(EXCLUDE), $(patsubst %/, %, $(sort $(dir $(wildcard ccan/*/*.c)))))
+# Anything with an _info file is a module.
+REALLY_ALL=$(patsubst ccan/%/_info, %, $(wildcard ccan/*/_info))
+
+# Exclude any modules we can't build.
+ALL=$(filter-out $(EXCLUDE), $(REALLY_ALL))
+
+# Anything with C files needs building; dir leaves / on, sort uniquifies
+DIRS=$(patsubst %/, %, $(sort $(foreach m, $(ALL), $(dir $(wildcard ccan/$m/*.c)))))
+
+# Generate everyone's separate Makefiles.
+-include $(foreach dir, $(DIRS), $(dir)-Makefile)
+
+ccan/%-Makefile:
+ @echo $@: $(wildcard ccan/$*/*.[ch]) ccan/$*/_info > $@
+ @echo ccan/$*.o: $(patsubst %.c, %.o, $(wildcard ccan/$*/*.c)) >> $@