/usr/share/doc/libqglviewer-dev-qt5/changelog.Debian.gz is in libqglviewer-dev-qt5 2.6.3+dfsg2-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libqglviewer-dev-qt5/../libqglviewer2-qt5/changelog.Debian.gz