How do I configure audio in/output

[dreamtheater]

I've tried the 3.0.6 zynaddsubfx Linux binary but I could not figure out how to configure input/output. When I start it, I see:

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Starting Audio: OSS
ERROR - I can't open the /dev/dsp.

When I try zynaddsubfx -O jack -I jack, I get:

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Error: JACK is not a recognized audio backend
       Defaulting to the NULL audio backend
Error: JACK is not a recognized MIDI input source
       Defaulting to the NULL input source

What do I have to do in order to get zynaddsubfx to use jack (or get any audio, for that mater) on Linux?

[fundamental]

If zyn is complaining that jack isn't a recognized audio backend then it wasn't compiled with jack support. It needs to be compiled with support for the various backends to be able to use them.