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I've tried the 29/10 patch with my home system (dpkg-dev 1.10,
debhelper 4.1.90 and dh-make 0.30) and another "pure woody"
system (dpkg-dev 1.9.21, debhelper 4.0.2 and dh-make 0.30).

I've used your test suite and some of my personal projects
(using both bdist_deb and dh_make); as far as I can tell, it
works very well. :-)

bdist_deb always worked as expected, producing good debian
packages.

I've used dh_make and then I've run "dpkg-buildpackage
-rfakeroot" and I got some errors (but I'm not sure they
depends on your code).  Also your test suite produced some
failures.

Here you can find the output of "dpkg-buildpackage -rfakeroot"
and of your tests suite (both were running on my home system):
  http://erlug.linux.it/~da/tmp/dpkg-buildpackage
  http://erlug.linux.it/~da/tmp/testsuite


Thank you for your great effort!