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.

You can find explanations about quilt usage in the following file:
/usr/share/doc/quilt/README.source

 -- Arnaud Fontaine <arnau@debian.org>, Fri,  9 Oct 2009 17:06:48 +0100
