My name is Simon, I am a long-time user of JACK on Debian-based Linux
systems. I prefer to compile JACK myself so I always set the
JACK-packages in Debian to "hold", remove everything from /usr and put
my build into /usr/local.
Starting with Debian 6.0 "squeeze" (Kernel is 2.6.38-1-686 #1 SMP), this
seems to cause problems somewhere. I checked out jackdmp from SVN
yesterday, build was ok. jackdmp starts up, QJackCtl is able to connect
and the connection graph shows up.
But any other client I want to use with JACK causes the following error:
Cannot connect to server socket err = No such file or directory
Cannot connect to server socket
jack server is not running or cannot be started
My test client of choice is mplayer. (SVN r3418)
I checked whether the runtime linker uses the correct libs: