Problem building nested ls file structure

[kristianmandrup]

Trying to build using a nested folder structure for divide/conquer of logic.
Not used to Makefile, how to I make all my nested ls files compile into lib !?!?.

LIB = $(SRC:src/%.ls=lib/%.js)

lib:
	rm -rf lib
	mkdir -p lib/

lib/%.js: src/%.ls lib
	$(LSC) --compile --output lib "$<"

lib/replace/%.js: src/replace/%.ls lib/replace
	$(LSC) --compile --output lib/replace "$<"

lib/runner/%.js: src/runner/%.ls lib/runner
	$(LSC) --compile --output lib/runner "$<"