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.

[audllew]

Could someone shed some light on how to get jack enabled, please? I have the same issue. Building on Xubuntu 24.04 (I know, not the best distro for this; sort of a test so I don't end up destroying my Ubuntu Studio system). The make system is not finding jack. Well, it's named "jackd" not "jack". So I need a make option to tell the it what the thing is called or to enable jack whether it finds it or not. I can't find any such options so far. Theoretically I suppose something could be done with a symbolic link from "jack" to "jackd" but jack is notoriously complicated and if I need more than one it seems really kludgey. Thanks for reading!
--Edit: That didn't work. I started looking through some of the makefiles to see if I could find out what it is looking for, but I haven't found it. It's not looking for "jack", and it can't find jack whether it's running or not. So what the heck is it looking for? I assume this does work (but maybe not on Ubuntu?).

[audllew]

I installed libjack-dev via the package manager and it finds jack now.