Quoth Tony Kimball on Monday, 23 April: :: Any guesses how far I will get if I use : --enable-threads=no in libstdc++-v3? Looks like it should be nigh trivial to write libstdc++-v3/config/threads-win32.h and walk the lib for _PTHREADS. I'll continue on that tack in the 'morning'. I must be getting punchy, replying to my own mail.