Takashi Yano via Cygwin writes: >> So what happens if you undefine __GTHREAD_MUTEX_INIT? > > I have tried. The test case: …and then rebuild libstdc++ of course. Regards, Achim. -- +<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+ SD adaptation for Waldorf Blofeld V1.15B11: http://Synth.Stromeko.net/Downloads.html#WaldorfSDada