I reported an error yesterday that I thought stemmed from my trying to use a toolset variant. I changed my regression.py run to use the "stock" toolsets and I'm still getting an identical error (though now with the stock toolset name "sunpro"). Nothing is being built and no tests are being run as a result: http://article.gmane.org/gmane.comp.lib.boost.build/8071 -- Caleb Epstein caleb dot epstein at gmail dot com