Package: qt5-qhelpgenerator

"qt5-qhelpgenerator" package binaries on CentOS:

/usr/bin/qhelpgenerator-qt5 /usr/lib64/qt5/bin/qhelpgenerator /usr/lib64/qt5/bin/qhelpgenerator-qt5

You may install this package on CentOS with yum install qt5-qhelpgenerator