Maybe make jna-4 optional, jna-3 is preferred here

Why are we forced to use JNA-4? (Looks like it was introduced in 1486? [1]) In my distro, it pulls in a whole bunch of X11 stuff, starting with libXt, none of which I need since it's a headless server. JNA-3 doesn't have such dependencies. Things compile and work fine here with jna-3.4.1 if I

Re: Maybe make jna-4 optional, jna-3 is preferred here

Nevermind, jna-4 did not actually need libXt or any X11 stuff (with a headless configuration). Woops. Carry on.