which modules for build slrn from git

Attempting to build slrn/slrnpull from the git repo... I see the
INSTALL.txt file included in the git branch says in part:

  slrn makes extensive use of version 2.X of the S-Lang programmer's
  library.  You will need to have this library *and* its components
  (slsh+modules) installed before you can build slrn.  See
  <http://www.jedsoft.org/slang/> for links to the library.

I can see on S-Lang download pages where to get slsh but it is not
clear at all which modules are being referred to above.

It appears their are a goodly number of modules... I'm guessing not all
are required.

Can anyone coach me a bit on which I should have for a build from
source? 


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