There's an out-of-date workaround in dynamic_bitset/config.hpp, which tests the compiler version to see if a GCC bug is still present. The bug is still present in GCC 3.4, so BOOST_TESTED_AT should test 30400. Also, boost/variant/detail/move.hpp contains this: #if defined(BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP) \ || BOOST_WORKAROUND(__GNUC__, BOOST_TESTED_AT(2)) Should that be changed? IIUC that means that GCC 3.x uses the workaround for non-ADL compilers. Since GCC 3.x has pretty good (not perfect) ADL, and since the BOOST_TESTED_AT is outdated, that test should be changed. Finally, boost/iterator/detail/config_def.hpp tests # if BOOST_WORKAROUND(__GNUC__, == 2) && BOOST_WORKAROUND(__GNUC_MINOR__, BOOST_TESTED_AT(95)) \ This looks outdated - there will be no more GCC 2.x releases and I would be surprised if vendor-specific releases such as RedHat's GCC 2.96 fixed that issue, but GCC 3 probably did. I can check this assumption if someone can provide a testcase but I would expect the test can be changed to simply: # if BOOST_WORKAROUND(__GNUC__, == 2) \ since it applies to all known version of GCC 2.x, and there will not be any more 2.x releases. The attached patches make the first two changes. I have left the third, since it doesn't affect GCC 3.x so is doing no harm, and because I'm not sure the bug has been fixed. jon -- I listen a lot and talk less. You can't learn anything when you're talking. - Bing Crosby