Hi, I've been looking through Boost.Atomic and Boost.Thread tests on the "lazy piranha fedora 17 64" tester, intel-linux-13.0.1 compiler. The tests fail because Boost.Thread does not compile because of Boost.Hash. Here's an example of build log: http://www.boost.org/development/tests/trunk/developer/output/lazy%20piranha... The problem is that apparently BOOST_HASH_CONFORMANT_FLOATS is not defined on this compiler while there are both ::fpclassify and std::fpclassify functions. Are there valid reasons for not defining the macro on this compiler?