I’ve got a brand new MBP 16’’ from my employer and tried to use MacPorts on 
that.

Since it is so new it sports macOS Big Sur 11.3 and Xcode 12.5

I know both are very recent and came out just a couple of days ago, so I am not 
expecting the impossible.

Installing MacPorts itself went flawlessly but when I tried to install some 
ports (git, ImageMagick, … I gave up after those failed) I got the same error 
repeatedly:

clang: error: invalid version number in 'MACOSX_DEPLOYMENT_TARGET=11.3‘

is this error already known and is it even a MacPorts error, e.g. should I file 
a bug report?

This usually indicates that your Command Line Tools are outdated. If Software Update won't update them, you are affected by an Apple bug, and will need to follow the instructions here: <https://trac.macports.org/wiki/ProblemHotlist#reinstall-clt>

- Josh

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