MuseScore 3.6.1 not compiling with Qt 5.12.8
Since MuseScore 3.6.1 doesn't even start compiling with Qt 5.15 (see https://musescore.org/en/node/299758), I moved back to Qt 5.12.8 and it gives a different error right at the beginning of the compilation process:
No rule to make target 'all.h', needed by 'CMakeFiles/mops1'. Stop.
The version 3.4 used to compile fine with this same Qt version, same installation.
System: Linux Ubuntu 20.04