Thanks for the potential contribution @fepitre. Sorry for the delay in response, we're still working out the kinks with our contribution process. CentOS Stream 8 is still built "inside out". What I mean by that is that there is still an internal dist-git and build system where RHEL builds are done, before being exported automatically to this dist-git to be built in the CentOS build system. This means that we can't merge this pull request directly. We can however use it to demonstrate changes and generate a patch file that can be applied to the internal dist-git by RHEL maintainers, if they decide to accept the change. To get their attention, would you mind filing a bugzilla describing this change in detail? This link will pre-populate the necessary fields. Please also link to this pull request in that bugzilla.

https://bugzilla.redhat.com/enter_bug.cgi?product=Red%20Hat%20Enterprise%20Linux%208&version=CentOS%20Stream&component=pycairo

This will work much better in CentOS Stream 9, as we're moving to having the RHEL maintainers work directly in a public dist-git so that can merge pull requests from contributors.