I got across this too today, good thing this thread saved it quickly, now I remember Qt got updated like 2 months ago. (I know this is old thread, but it's the only one with "qtdir". )
This is more of a git issue, than DolphinQt.
With the existing Externals/Qt submodule, and my upstream/downstream configuration, all I had to use was the --remote option, as in "git submodule update --recursive --remote" then it pulled the proper latest one from the upstream remote, which in my case is the official primary dolphin-emu repository.
This is more of a git issue, than DolphinQt.
With the existing Externals/Qt submodule, and my upstream/downstream configuration, all I had to use was the --remote option, as in "git submodule update --recursive --remote" then it pulled the proper latest one from the upstream remote, which in my case is the official primary dolphin-emu repository.