Android bulding. system.img build make script

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http://forum.xda-developers.com – Hello guys. I am new in Android Developing. I tried to build android os from sources. Now I change some files in out/product/<my_product>/system/ and want rebuild system.img. Where I can find system.img build make script? I know I posted this message an not correct topic, but I haven't 10 messages for posting to correct topic. Thanks. Sorry for my English =) (HowTos)