gistfile1.bash

get Android source code: http://source.android.com/source/downloading.html

$ cd /path/to/android-src
$ cd system/core/libmincrypt/
$ gcc -c *.c -I../include
$ ar rcs libmincrypt.a  *.o
$ cd ../mkbootimg
$ gcc mkbootimg.c -o mkbootimg -I../include ../libmincrypt/libmincrypt.a
$ cd ../cpio
$ gcc mkbootfs.c  -o mkbootfs -I../include

copy system/core/mkbootimg/mkbootimg, system/core/cpio/mkbootfs to a directory in your path.