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I've packaged latexdiff for debian, that is a small utility to generate latex files with revision markers from multiple versions of the same file. While packaging this utility I've learned about two very nice tools to help the debian maintainers: git-buildpackage and topgit.

Regarding git-buildpackage there is an extensive manual that should get you started :
http://honk.sigxcpu.org/projects/git-buildpackage/manual-html/gbp.html

Topgit documentation is a bit sparse. tg help should guide you for syntax. The README file in the tg distribution is full of examples.