John, you reported previously that some TR1 tests fail on sun, which you suspected to be V2 issue. You said, specifically: A typical list of errors here: http://tinyurl.com/pcwf5 suggests that the "real" version of <memory> is getting included rather than the Tr1 version. The command line shows that the TR1 headers are in the path, but *after* the Boost include path, and while I'm not completely sure, I believe this is the problem On closer look, I think I don't understand what's going on. The "real" <memory> is in "standard" include directories, and that "standard" include directory is not present in command line at all. Even though boost include directory is present before TR1 include directory, I see no way how this can cause system <memory> to be preferred to TR1's <memory>. Could it be that the problem is somewhat more contrived? Doug, as a quick check, can you try running the same command that fails, but with the order of -I".." and -I"/home/user1/dgregor/BoostRegressionTesting/boost/boost/tr1/tr1" reversed? If that works, can you run the failing command with -save-temps, and send me the .ii file? Thanks, Volodya