Packaging

Please also see How to build and dependencies.

Your distribution may provide packages of xpra, unfortunately those tend to be problematic - see wiki/Packaging/DistributionPackages.

RPMs

The spec file can be found here: xpra.spec
The quick and easy way (tested on Fedora 25):

mkdir -p ${HOME}/rpmbuild/SOURCES/ >& /dev/null
cd trunk/src
./setup.py sdist --formats=bztar
cp dist/*bz2 ${HOME}/rpmbuild/SOURCES/
cp patches/* ${HOME}/rpmbuild/SOURCES/
rpmbuild -ba ../rpmbuild/xpra.spec
ls -s ${HOME}/rpmbuild/RPMS/*/

DEBs

You can find the debian packaging files here: /debian
Debian also ships packages, though the "stable" versions are completely out of date, broken and unsupported, they should not be used.
Assuming that your build system is reasonably up to date, you should be able to build with:

cd trunk/src/
ln -sf ../debian .
debuild -us -uc -b

PS: ​packaging is hard