please install module in order to install this package

[davemilter]

I get such error if I run:

~/.local/bin/py2deb -r /tmp -- buildbot-www

2020-04-24 12:37:49 lts-debug pip.utils[24552] INFO Complete output from command python setup.py egg_info:
2020-04-24 12:37:49 lts-debug pip.utils[24552] INFO Please install buildbot_pkg module in order to install that package, or use the pre-build .whl modules available on pypi

----------------------------------------
2020-04-24 12:37:49 lts-debug py2deb.cli[24552] ERROR Caught an unhandled exception!

So the problem that buildbot-www is depend on buildbot.
I create requirements.txt:
requirements.txt.zip
with buildbot and buildbot-www and all dependicies:

$ grep buildbot requirements.txt
buildbot==2.7.0
buildbot-www==2.7.0

but I got the same error during:

 ~/.local/bin/py2deb -r /tmp -- -r /tmp/requirements.txt

So how can I can I help py2deb find buildbot package?