Sorry for the delayed reply (stuck with work).
In order to buld oolite 1.73.4 you need the following:
These libraries have other sub-dependencies and can be found at the respective project sites.
The few things that I know for slackware is that the user builds everything from source.
Lately I decided to do the same in my Ubuntu box. I got tired of all these distro-updates messing up with my libraries.
So, I built the main oolite dependency libraries from source. The big listing I posted was from this experience.
As soon as the libraries where installed, I just moved into the oolite src code folder and executed
$ make -f Makefile release
...and that's it. The Makefile automatically builds SpiderMonkey and then proceeds with the oolite code.
The truth is I do not have the courage to setup a box with slackware and prepare a "how to" for slackware all by myself.
On the other hand if you are interested we could try to nail this together.