Update your Fedora packages for Fedora 20
The packages here don't work on Fedora 20:
I looks like you just need to recompile against a newer version of libtiff.
Brendan Long commented
Providing an installer (like you do for PlasticSCM) would be a usable workaround, if updating these every 6 months is too much. It wouldn't be ideal, but it would work.