Jan Engelhardt (and anybody else involved in X2Go's openSUSE Build Service for Fedora),
It appears that the nx-libs packages are failing to compile for Fedora 19. It is thus impossible to install x2go using the OBS Fedora 19 repo: https://build.opensuse.org/project/show/X11:RemoteDesktop:x2go
Some people have suggested the workaround of using the Fedora 18 repo on Fedora 19. That workaround seems to have worked for me. However, I plan on updating the wiki (I have an account) and I do not want to write that people should use the Fedora 18 repo on Fedora 19 unless I get confirmation that it is safe to do so. https://ask.fedoraproject.org/question/31602/cant-install-x2go-on-f19/
I might be able to help with fixing the nx-libs compiliation issue. According to the OBS, it looks like newer versions of nx-libs are failing to compile on Fedora 18, RHEL5 and RHEL6 also: https://build.opensuse.org/project/monitor/X11:RemoteDesktop:x2go?blocked=0&building=0&dispatching=0&finished=0&pkgname=nx-libs&scheduled=0&signing=0&succeeded=0
-Mike