/usr/lib/python2.6/dist-packages/hgext/qct.py is in qct 1.7-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.6/dist-packages/hgext/../../../../share/pyshared/hgext/qct.py
/usr/lib/python2.6/dist-packages/hgext/../../../../share/pyshared/hgext/qct.py