for build source build source
This lc &file &^file $(PWD)/&file $(abs_src)/&file
- directory any &/file &^/file $(PWD)&/file $(abs_src)/&/file
+ directory any &/file &^/file $(PWD)/&file $(abs_src)/&/file
several & f g h &^ f g h $(addprefix...)
Top lc file &~file