This package uses quilt to manage all modifications to the upstream source. Changes are stored in the source package as diffs in debian/patches and applied during the build. See /usr/share/doc/quilt/README.source for a detailed explanation. This package uses the version 3.0 of the debian source package; An upstream tarball is required to build it. This tarball can be generated automagically by downloading the sources from the github repository with the following command: fakeroot debian/rules get-orig-source