Hi, I had the same problem. It's because the bio2jack make install script (was from the v0.5 release in my case) is not copying the bio2jack-config script to the install destination. When the MPlayer configure script tries to compile the jack test code it can't find bio2jack-config and disable the jack audio output. Until a fix in the source package is released for bio2jack, the easy and simple fix is to copy bio2jack-config from the compiled source dir to the right place in your system path... probably /usr/local/bin You also need to chmod a+x the file, which make install would have done too. I hope this can help. Pierre Delagrave