makefile_dir
............\.Makefile.swp
............\Makefile
............\bar
............\...\Makefile
............\...\bar.a
............\...\bar.c
............\...\bar.o
............\...\common.c
............\...\common.o
............\...\libbar.a
............\configs
............\.......\bar.h
............\.......\foo.h
............\example.c
............\example.o
............\foo
............\...\.Makefile.swp
............\...\Makefile
............\...\common.c
............\...\common.o
............\...\foo.a
............\...\foo.c
............\...\foo.o
............\...\libfoo.a
............\inc.mk
............\main
............\main.c
............\main.o