Hi Maxim, > When you judge the branch ready to merge, could you please send a subset > of the patches (at least the ones touching the python-build-system > directly) to this issue (marked as v2 -- git send-email -v2) so that > they can be more easily commented? I had some time to finish my work, so I pushed all of my changes to wip-python-pep517 and attached changes that do not fix individual packages to this email. Since my last version I added support for building Python 2 packages, although we should really phase out Python 2 asap. I kept support for nose and setup.py’s test target, because they are still in use/valuable, but we can also remove them if you prefer. Please have a look when time permits. If all is good we can move on to fix failing packages. Thank you very much, Lars