Here is the build log from unpatched gpgme https://www.zq1.de/~bernhard/temp/gpgme-build-log-2033.txt
it has some tracebacks from t-callbacks.py

closing

Found https://dev.gnupg.org/rE5494a5728418938d2e42158bb646b07124184e64 - code looks very nice and my rebuild tests also show the expected results.

In D436#3190, @werner wrote:

A better way to to this is my modifying yat2m. I just did this.