Hello Mathias,
* Mathias Brodala <info@noctus.net>, [2007-05-05 15:08 +0200]:
> I?m a bit clueless right now how to modify the package source during
> pbuilder?s run. At the moment I only want to modify debian/rules
> within Thunar?s source tree, but it does not affect the build result
> if I modify the sources in the current directory.
I find pdebuild to be quite convenient for this purpose, give it a try.
ciao,
ema