You reinstalled libqt5help5, but please try also reinstalling qttools5-dev.
That is the package that contains the .pc and header files.
/usr/include/x86_64-linux-gnu/qt5/QtHelp/QHelpEngine is present in that package. If some other includes are missing, please let me know which ones.
You reinstalled libqt5help5, but please try also reinstalling qttools5-dev.
That is the package that contains the .pc and header files.
/usr/include/ x86_64- linux-gnu/ qt5/QtHelp/ QHelpEngine is present in that package. If some other includes are missing, please let me know which ones.