/mnt/mxe/usr/i686-w64-mingw32.static/include/pthread.h
// typedef uintptr_t pthread_t;
// remark it out for litebar
And finally, I did it! Thank you very much, Spidersbox, you helped me a lot.
glad to help - it wasn't that long ago when I was pulling my hair out trying to figure it out. several hours of searching the web, and trial and error