This sounds like a problem that has been experienced before and was fixed by patching the end of a cmake file, but I do not recall the specifics. Any one recall where/what cmake file is responsible for including libdbus- tqt-1?
I'm no compiler expert, not even close, sunny or rainy day. Unless Arch is REALLY different from other distros, I would pause to consider what else might be causing the errors. That is, the rest of the team is building full package sets without the same errors.
That said, yes, you could have stumbled across a corner case that Arch exposes. We've seen that before around here. :)
Darrell