Latest homebrew is taking care about this. https://github.com/freecad/homebrew-freecad/Anno Me Nuehm wrote: ↑Wed Oct 21, 2020 4:03 amDo I need the qt5 development files (headers, libraries) for the re-compiling of FC?vejmarie wrote: ↑Tue Oct 20, 2020 11:22 pmI suspect this is more an XCode / OS build time related issue than anything else especially if 0.18 works. If you want to give a try to the homebrew build and let me know if that works better. be aware that the installation might be requiring that your recompile opencascade and freecad to support properly BigSur. It take times, but it will work I am pretty convinced.
How would I go about tapping the FC 0.19 branch?
And yes you need qt5 development files, for re-compiling freecad 0.19. Just install everything with homebrew and you shall be good. Most of them are bottles which will come from Catalina. Only opencascade and freecad needs to be recompiled by adding the -s switch.