Building documentation fails with asciidoc: section title not permitted in delimited block

[frainz-de]

Hi,

when building the documentation with make gendoc, it fails with many lines of
asciidoc: ERROR: asciidoc.tmp: line []: section title not permitted in delimited block

I'm using asciidoc 9.1.0 and doxygen 1.9.1

[sabishiii]

I just ran into the same problem, and the fix was quite simple: Make sure that you have Python2 installed and replace the shebang lines in the doc/*.py files with "#/usr/bin/env python2"