Just a side note: I patched the alidist recipe for DebugGUI. With that patch the build works for me without having to uninstall libtbb-dev on Ubuntu 20.04.
I have the feeling that the TBB=off flag is not correctly handled.
So the change is simply to add the flag -ltbb to make.
Not sure if this has side effect, since for me DebugGUI is unfortunately not working (LLVM Error in the TPC reconstruction workflow - #30 by oschmidt)
Patch: (.patch files cannot be uploaded)
debuggui.txt (1.0 KB)