[boost] Marking explicit failures -- need help

Hi All, I would like to make some regression tests as expected to fail in explicit-failures-markup.xml, but I have the following problem. Not sure if this is specific to Optional tests: http://www.boost.org/development/tests/develop/developer/optional.html I have two "columns" with the same toolset label "gcc-4.4.7" from tester "Sandia". On one the test passes, on the other: it fails. This is because on one C++0x is enabled. But I cannot tell it from the toolset label alone, and therefore I cannot make the correct entry in failures-markup.xml: either I mark too much or too little. Does anyone know away around it? Can you mark failures based on something else than toolset name? Regards, Andrzej