I have a jamfile.v2 in a sandbox project that used to work before. I have started using modular-boost, and after some fumbling, I'm using that OK-ish. The message is: Unable to find the Boost source tree in the locations searched. Try setting the environment variable BOOST to point to your Boost tree, or else invoke bjam with the --boost=path option. The Boost include path will not be automatically set. The paths searched were I:\boost-sandbox\guild/../boost I:\boost-sandbox\guild/../Trunk But the file LICENSE_1_0.txt was not found in any of them Unable to find the Boost.Build source tree in the locations searched. Try setting the environment variable BOOST_BUILD to point to your Boost.Build tree, or else invoke bjam with the --boost-build=path option. The paths searched were i:\modular-boost\tools\build\v2 But bootstrap.jam was not found in any of these More failures will very likely follow... (And they did ;-( ) I've tried some guesses at parameters including b2 --boost=i:\modular-boost --boost-build=i:\modular-boost\tools\build -a html without success. I have boost-build.jam at I:\modular-boost Suggestions please. Paul PS I'd like to change environment variables if possible to avoid changing lots of .bat files that call b2. --- Paul A. Bristow, Prizet Farmhouse, Kendal LA8 8AB UK +44 1539 561830 07714330204 pbristow@hetp.u-net.com