So ... I installed the Qt5 libs using advice from here:
https://theredblacktree.wordpress.com/2 ... -and-pi-2/
pi@radiopi ~/TauLabs/TauLabs-20151123 $ qtpaths --qt-version
But make still gives me:
Project MESSAGE: Cannot build GCS with Qt version 4.8.2.
Project ERROR: Cannot build GCS with Qt version 4.8.2. Use at least Qt 5.0.1!
Any hints oh how I can convince Make to take my Qt5?