[Boost-users] [BJAM / BGL] build error: no builtin module .ENVIRON is found

Hi, I'm trying to compile the boost graph library python bindings. They need Boost.Jam version 3.1.12 which I have downloaded and built from CVS. However when I run bjam I get the following error: error: no builtin module .ENVIRON is found error: your version of bjam is likely out of date error: please get a fresh version from CVS. Can anyone tell me what I'm doing wrong? Perhaps this is a problem with the BGL Jamfiles? Thanks, John.