Created attachment 211683 [details]
Building on 12.1 amd64 gives errors like:
In file included from qwt_graphic.cpp:11:
./qwt_painter_command.h:85:22: error: field has incomplete type 'QPainterPath'
/usr/local/include/qt5/QtGui/qmatrix.h:54:7: note: forward declaration of 'QPainterPath'
Here is a full build log: http://pkg.awarnach.mathstat.dal.ca/data/12amd64-default/2020-12-26_15h29m39s/logs/errors/GoldenCheetah-3.5.log
I forgot to mention, this was in the ports tree in the past under games/, so we should probably resurrect that port.