QwtLegend signal 'clicked' not found
Incompatybility with Qt 6.8
Nobody suggested that: the other bug reports indicate, that the problem has been fixed in Qwt 6.3.0. And for the record: AFAIR it was about an incompatibility between Qt versions - nothing I could have known in advance when releasing Qwt 6.2.x. So again: are you sure that you are running Qwt 6.3 ?
rpath fixed opengl seting fixed in playground.pri
avoid QCheckBox::stateChanged for Qt >= 6.7 where it is deprecated
Merge branch 'develop' of https://git.code.sf.net/p/qwt/git into develop
IWYU pragma
avoid QCheckBox::stateChanged for Qt >= 6.7 where it is deprecated