PoDoFo recently caused some build problems, which are fixed in SVN
but a release is still missing. Additionally, and more importantly,
there are some unfixed security issues, even in SVN [1]. Poppler
also has a nice Qt5 frontend. All in all, enough reason to prefer
it over PoDoFo and only fall back to it if Poppler isn't found.
[1] https://sourceforge.net/p/podofo/mailman/message/36200341/