"Link with Qt" doesn't accept local builds

1. Start Creator with parameter "-tcs".
2. Click "Link with Qt".
3. Try selecting a Qt version you built locally.
   It doesn't accept my builds in paths like:

   /home/qtrob/dev/g++-9.3.0/qt-5.15.2-nowebengine-devbld/qtbase/bin/qmake
   /home/qtrob/dev/clang-10.0.0/qt-dev-base_svg-03.19-fasan-no-openssl/qtbase/bin/qmake
   

   It doesn't make a different whether I enter the whole path to qmake or any of the higher directories.

I don't see a reason why it shouldn't be possible to link to these versions.