If qt4 is enabled, it fails to build with this error.
/bin/mkdir -p _gen
make: Entering directory `/var/lib/buildbot/telepathy/tp-yts-default-i386/build/TelepathyYtstenutQt4'
In file included from cli-connection.h:4:0,
_gen/cli-connection.h:8:35: fatal error: TelepathyQt4/Connection: No such file or directory
See the full log here: http://buildbot.telepathy.im:8010/builders/telepathy-ytstenut%20-%20i386/builds/19/steps/compile/logs/stdio
QT support for C2S has not been commissioned, so this bug might well go as WONTFIX. Not trying to hold back volunteers though.
At least I know now that it should be disabled in buildbot for the time being
This won't be fixed for the time being