/usr/share/doc/libpoppler-qt4-dev/changelog.Debian.gz is in libpoppler-qt4-dev 0.18.4-1ubuntu3.2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libpoppler-qt4-dev/../libpoppler19/changelog.Debian.gz