To build the entire documentation, the following tools are needed:

1. A Perl interpreter for your platform
2. The following Perl modules available from CPAN:
   Font::TTF
   Sort::Versions
3. asciidoc
   http://asciidoc.org/
4. xmlto
   https://fedorahosted.org/xmlto
5. One of:
	Adobe Acrobat (acrodist)
	Ghostscript (ps2pdf) http://download.ghostscript.com/
	pstopdf	(available on some BSD-derived Unix systems)

	Of these, Ghostscript is the most tested, although Acrobat has
	been claimed to generate smaller files.
6. For best results, the Google Roboto and Roboto Mono fonts,
   available for free at: https://github.com/googlefonts/
