/usr/share/doc/libmapnik-dev/changelog.Debian.gz is in libmapnik-dev 2.2.0+ds1-6build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libmapnik-dev/../libmapnik2.2/changelog.Debian.gz
/usr/share/doc/libmapnik-dev/../libmapnik2.2/changelog.Debian.gz