Vladimir Prus wrote:

> project-root.jam is something that should not be used, or mentioned

> anywhere. What parts of manual mention it?

If you open up http://www.boost.org/tools/build/v2/doc/userman.pdf with Adobe Reader and search for project-root, there are seven references.  For example, under "Frequently Asked Questions" there is "How to get the project-root location"; the rest are under the Extender Manual.  I also have what may be an older version of the manual (90 pages, includes chapters "Overview" and "Common tasks" that are not in the manual I now find on boost.org), and it has additional references to project-root.