Building and installing the info file additionally requires
makeinfo and docbook2X. Version 0.8.3 is known to work.
+ Building and installing the pdf file additionally requires
+ dblatex. Version 0.2.7 with asciidoc >= 8.2.7 is known to work.
+
The documentation is written for AsciiDoc 7, but "make
ASCIIDOC8=YesPlease doc" will let you format with AsciiDoc 8.