For applying the debdiff it works for me as folows:
pull-lp-source brlaser cd brlaser-3 quilt pop -a patch -p1 < ../../brlaser_3-6_4-0ubuntu1.debdiff
For applying the debdiff it works for me as folows:
pull-lp-source brlaser 3-6_4-0ubuntu1. debdiff
cd brlaser-3
quilt pop -a
patch -p1 < ../../brlaser_