Hi, I'm trying to compile a 64 bit jack application (radium) with mingw-64. When I compile it in 32 bit mode, it works fine, but when creating a 64 bit version, it crashes when calling a jack_* function. The same happens when trying to run a simple test program: " #include <jack/jack.h> int main(){ jack_ringbuffer_create(8000); // (Also crashes if callling jack_client_open) return 0; } " If I compile it like this (32 bit): $ i686-w64-mingw32-gcc winjacktest.c -I/home/kjetil/.wine/drive_c/Program\ Files/Jack/includes /home/kjetil/.wine/drive_c/Program\ Files/Jack/lib/libjack.lib ...it works But if I compile it like this (64 bit): $ x86_64-w64-mingw32-gcc winjacktest.c -I/home/kjetil/.wine/drive_c/Program\ Files/Jack/includes /home/kjetil/.wine/drive_c/Program\ Files/Jack/lib/libjack64.lib ...it crashes. I also have a backtrace. The second last frame in the backtrace is the call to "jack_ringbuffer", while the last frame shows that an unrelated function is called instead of jack_rinbuffer_create. So it seems like either the stack itself is a little bit corrupted, or libjack64.lib sends the program further to a random place in the program instead of the libjack64.dll library. The latter might be more likely though, since it's the same backtrace every time. I've tried installed both the 32 bit and the 64 bit version of jack which are available for download at jackaudio.org. Same behaviour for both. My gcc is a little bit old, but I guess that isn't the reason for the crash: $ x86_64-w64-mingw32-gcc --version x86_64-w64-mingw32-gcc (GCC) 4.7.2 20120920 (Fedora MinGW 4.7.2-7.fc17) $ i686-w64-mingw32-gcc --version i686-w64-mingw32-gcc (GCC) 4.7.2 20120920 (Fedora MinGW 4.7.2-7.fc17) Thanks for any help. Please let me know if there's anything I should try.