florian@florian-desktop:/tmp/xkcd/usplash-theme-ubuntu-0.18/$ dpkg-buildpackage -rfakeroot -uc -us
[...]
fakeroot debian/rules clean
/usr/bin/fakeroot: 166: debian/rules: Permission denied
dpkg-buildpackage: failure: fakeroot debian/rules clean gave error exit status 126

florian@florian-desktop:/tmp/xkcd/usplash-theme-ubuntu-0.18/$ ls -l debian/rules
-rw-r--r-- 1 florian florian 1087 2008-08-25 12:26 /tmp/xkcd/usplash-theme-ubuntu-0.18/debian/rules