-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 It looks like the gcc bug (pr 11953) that inspired the workaround in boost/config/stdlib/libstdcpp3.hpp that goes: #ifdef __GLIBCXX__ // gcc 3.4 and greater: # if defined(_GLIBCXX_HAVE_GTHR_DEFAULT) \ || defined(_GLIBCXX__PTHREADS) // // If the std lib has thread support turned on, then turn it on in Boost // as well. We do this because some gcc-3.4 std lib headers define _REENTANT // while others do not... // # define BOOST_HAS_THREADS was fixed for mainstream gcc 4.1.2 and later versions in December of 2006. So can we change the first line to something like: #ifdef __GLIBCXX__ && __GLIBCXX__<20070101 so detection of whether gcc is in multi-threaded mode or not works again? -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFI4Rim5vihyNWuA4URAs/NAJ45aP24OAUerZUaV48Y1faYt0GsSACeOoJi eiWSbyfmjW8653luxIe0U/s= =HySJ -----END PGP SIGNATURE-----