From your post I cannot really determine how far you got before you got stuck. Did you successfully compile and install the openLDAP server software? If not, I can provide a build script for an older release (2.2.13) that might work for the current stable 2.2.26. You will need a version of Berkeley DB4, but you might just use the version that comes with Slackware.
I have ran OpenLDAP on my old Slackware 9.0 server for authentication (to see if it worked - it did!) but have since then re-installed a newer Slackware. There is no need for PAM on Slackware if you want LDAP authentication. There is a FAQ entry at the
if you want to know more about how to authenticate your users against an LDAP database.
The tutorial that is part of the OpenLDAP documentation should help you setup a basic LDAP server in a relatively short time: http://www.openldap.org/doc/admin22/quickstart.html
and I would suggest that you make yourself familiar with the LDIF file format so that you can add/modify stuff in your database once it is running.
Also, there are several good tools fdr manipulating LDAP server databases, The ones I use are ldapvi
which is very nice if you want to make changes but don't know the LDIF file format, and JXplorer
which is a great
cross-platform (Java based) GUI appliction for manupulating an LDAP server at the low level.
For LDAP user management, there is a web-based tool called LAM
which I use on Samba servers that authenticate against LDAP.
Hope all of this helps.