Then cd into libs/type_traits/doc and do a: bjam
There may be some complications building in the sandbox rather than the Trunk but ping me if that's the case.
I obtain this error: $ /home/bronf/usr/build/boost_1_39_0/bjam Unable to load Boost.Build: could not find "boost-build.jam" --------------------------------------------------------------- Attempted search from /home/bronf/boost_sandbox/type_traits/libs/type_traits/doc up to the root and in these directories from BOOST_BUILD_PATH and BOOST_ROOT: /usr/share/boost-build. Please consult the documentation at 'http://www.boost.org'.
Something seems to have stopped working as it did :-( But if you set the environment variable BOOST_BUILD_PATH to point to "<path-to-boost-trunk>/tools/build/v2" then it should build OK. HTH, John.