The test library's wide_string tests are failing on any platform because "wputenv" does not exist. Googling around a bit, I don't see much mention at all of "wputenv". There is a _wputenv on Microsoft compilers, but it takes wchar_t pointers, not char pointers. This is part of a much larger problem... a quick count in the regression tests shows about 300 failures coming from the test library. Most of these are on compilers we usually consider rather broken, but we need someone to look at these failures and either fix them or mark them. The Boost.Test library is one of the core libraries, on which every other library depends. It needs to be solid, stable, and portable, or we cannot release 1.33.0. Doug Gregor 1.33.0 Release Manager