This package uses CDBS (and therefore simple-patchsys.mk) in order to 
apply patches to the upstream source. Patches are stored in 
debian/patches and their filenames usually end in .patch or .diff .
For further details, see the man page for cdbs-edit-patch.

All commands described below should be run from the top directory of the 
package source tree, unless otherwise stated.

 * To generate the fully patched source, in a form ready for
   editing, that would be built to create Debian packages, run: 

     make -f debian/rules apply-patches

   Note: It has been proposed that, in future, this should happen 
   automatically when you run dpkg-source -x on a CDBS 
   simple-patchsys.mk source package.  However, this proposal has 
   apparently not yet been implemented, so for now you have to do 
   it yourself like this.

 * To modify the source and save those modifications so that
   they will be applied when building the package, pick a
   suitably informative patch file name, for example
   01_add_README.source_file.patch, and then run:

     cdbs-edit-patch 01_add_README.source_file.patch

   This will place you in a new shell in a temporary copy of the 
   source tree.  Make your desired modifications to it, and then 
   exit the shell to create the patch file containing them (this 
   file will appear in debian/patches).

 * To remove source modifications that are currently being
   applied when building the package, run:

     make -f debian/rules reverse-patches