I see that in the svn repository, externals/Makefile calls for pthreadGC2 when building with MinGW, while Miller's pd-0.47-1 makefile.mingw calls for pthread. And the last pd-extended for Windows has only pthreadVC.dll in its bin directory.Surely extended installer placed pthreadGC2 in the system32 folder or its equivalent sysWOW64