Hi, I've just downgraded from UbuntuStudioGutsy64 and I'm attempting to get Chuck running but I can't seem to understand this error that I'm getting. I have downloaded rtaudio4.0.3 and it looks like it compiled fine. make linux-jack make -f makefile.jack make[1]: Entering directory `/home/stochastic/Desktop/ChucK/chuck- 1.2.1.1/src' g++ -D__LINUX_JACK__ -c -O3 -D__CK_SNDFILE_NATIVE__ rtaudio.cpp rtaudio.cpp:2715:23: error: jack/jack.h: No such file or directory rtaudio.cpp:2721: error: ISO C++ forbids declaration of 'jack_client_t' with no type rtaudio.cpp:2721: error: expected ';' before '*' token rtaudio.cpp:2722: error: ISO C++ forbids declaration of 'jack_port_t' with no type rtaudio.cpp....... what obvious part am I missing? It would really be nice if some proper Linux documentation could be written into the upcoming versions of the install tutorial. I'd be happy to help write it once I understand it. Thanks. -Eric