Created attachment 659552 [details] build.log I think this version of purpose has a check to use a new object name for >=qt-5.15 which causes it to fail there. This check has since been reverted upstream: https://github.com/KDE/purpose/commit/b3842a0941858792e997bb35b679a3fdf3ef54ca
can confirm same build falure with 5.15.1 and build success with 5.15.0