I was trying to compile mkinitcpio from abslibre (https://git.parabola.nu/abslibre.git/tree/nonsystemd/mkinitcpio/PKGBUILD) with asciidoc in makedepends.
I got this error:

 |  Traceback (most recent call last):
 |    File "/usr/bin/a2x", line 5, in <module>
 |      from asciidoc.a2x import cli
 |  ModuleNotFoundError: No module named 'asciidoc'

There's 2 versions of asciidoc: in extra and libre (the version from extra works fine).
There's no asciidoc in blacklist.txt and abslibre.git

What's wrong with version from extra and why there are both versions in repositories?