Failed to find AudioUnit/AudioUnit.r

I had already posted about this a year ago, but since then got no useful answer.
It’s not possible to build the auwrapper with the VST SDK 3.7.1 and XCode 11.

An interesting detail in that there is a duplicate slash in this path:
… /Components//again_au.component

The same issue seems to appear also for other users and other frameworks: