I came across this when trying to fix a FTBFS for libffado.
BUILDSTDERR: Fatal Python error: PyQt5.QtCore: Unable to embed qt.conf
Note that another fix (scons->scons-2) is needed in the rawhide package to get to this stage.
The bug seems to be reported to and fixed upstream. Apparently it only affects python2:
This should be fixed in the latest python-qt5 rawhide build,
* Sun Aug 04 2019 Rex Dieter <email@example.com> - 5.13.0-1
With the latest updates, this now happens in F30:
$ mock -r fedora-30-x86_64
<mock-chroot> sh-5.0# python2 -c 'import PyQt5.QtCore'
Fatal Python error: PyQt5.QtCore: Unable to embed qt.conf
Aborted (core dumped)
The problem is that 5.13.0 is intended for Qt 5.13, and F30 (and even F31 and Rawhide, at this time) only has Qt 5.12, so PyQt5 was reverted to 5.12.3. So this bug is back now.
FEDORA-2019-723f2b467f has been submitted as an update to Fedora 30. https://bodhi.fedoraproject.org/updates/FEDORA-2019-723f2b467f
python-qt5-5.13.1-1.fc30, sip-4.19.19-1.fc30 has been pushed to the Fedora 30 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2019-723f2b467f
*** Bug 1761393 has been marked as a duplicate of this bug. ***
python-qt5-5.13.1-1.fc30, sip-4.19.19-1.fc30 has been pushed to the Fedora 30 stable repository. If problems still persist, please make note of it in this bug report.