slackpkg does not check for deps. I hate to answer questions like this because you are building somewhat of a custom system, or atleast I believe that you are. I have kdebase, kdelibs installed, everything works quite well. Dbus and HAL I recommend using, but that is a preference(and something you should read about if you are not using in Slackware).
here:
http://www.linuxfromscratch.org/blfs...media/k3b.html
As you can see it will limit its functionality and then the point of using k3b becomes quite mute(atleast for me). If you are going the route I believe you are going, look for an alternative program for your burning activities(k3b is a bloated, but wonderful program).