Unable to get extra info from virtualbox machine (CURRENT is unable to run Gnome3 and kde4 fails to compile).
Whether it's compiled withing pkg-installed qt4 packages it succeeds, otherwise (compiled by CURRENT clang 3.8.0 and latest ports) it fails.
Seems like there is smth hardcoded, not flexible within the port, smth about version or schema check...
Just like with bug 207919, your feedback is appreciated, but offers too little information for us to be able to do anything with it.
I've just tried building the mentioned port on Poudriere and everything worked as expected.
Without an error log and more information about whether you have any customizations with your builds we cannot fix anything.