This optional dependency is now finally dropped. So ends a long journey of trying to generate man pages in a lightweight and dependable way. The only thing I could figure out how to make work reliably was to just learn how to write roff myself. Yay.
AsciiDoc development is continued under asciidoctor. See https://github.com/asciidoc/asciidoc. We do however fallback to a2x if asciidoctor is not present. This is to ease migration, but at some point, it's likely that support for a2x will be dropped. Originally reported downstream: https://github.com/Homebrew/linuxbrew-core/issues/19885 Closes #1544