/usr/include/qhull/qh-qhull.htm is in libqhull-dev 2015.2-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/include/qhull/../libqhull/qh-qhull.htm
/usr/include/qhull/../libqhull/qh-qhull.htm