Building a wheel on Debian:
$ apt-get install python3-pkgconfig
$ apt-get install libpjproject-dev
$ python3 setup.py bdist_wheel
To make a new release:
$ git checkout master
$ python3 setup.py sdist
$ git checkout debian
$ gbp import-orig --upstream-vcs-tag=v1!1.0.3 --debian-branch debian dist/pjsua-1\!1.0.3.tar.gz
Edit d/changelog, etc.