XMMS is included in 'pkgsrc' ('audio/xmms') and it does NOT run
properly so because of Pthread problems. See,

  http://www.NetBSD.org/cgi-bin/query-pr-single.pl?number=11091

> As you might have noticed, I don't have lots of experience in compiling 
> stuff ;)

Try it! It's really nice if you succeed to use it! :-)

Masao