android_img_repack_tools is a kit utilites for unpack/repack android ext4 and boot images
how to make:
$ ./configure
will download source from android git repositories
$ make
will compille binaries: mkbootfs simg2simg make_ext4fs mkbootimg sgs4ext4fs unpackbootimg ext2simg img2simg simg2img
$ make clean
will clean sources
$ make clear
will remove sources