Created attachment 201977 [details] patch On powerpc64 (and possibly other 64-bit architectures) build fails: https://talos.anongoth.pl/data/powerpc64-default/2019-02-12_21h37m42s/logs/errors/qt5-core-5.12.1.log The reason is a change in configure tests for 64 bit atomics. For more info, look at upstream PR at https://github.com/qt/qtbase/pull/24. Tested on powerpc64 and amd64. Hardware sponsored by IntegriCloud.
Close with a better explanation.