[boost] Boost Filesystem v3 - requires wstring - an obstacle to testing the serialization library

The boost serialization library test suite uses Boost.Filesystem in order to build and run it's tests. Turns out that the tests under mngw fail to build with the following message: In file included from ..\libs\serialization\test\test_tools.hpp:10, from ..\libs\serialization\test\test_binary.cpp:24: ../boost/filesystem/operations.hpp:21:5: #error Configuration not supported: Boost.Filesystem V3 and later requires std::wstring support In file included from ../boost/filesystem/operations.hpp:24, So it seems that Boost.Filesystem requires support for wstring and mngw doesn't support it - so the serialization library tests can't run. Does anyone have any ideas for an expedient way to work around this? Robert Ramey