[plt-scheme] Slib and Init File

Hi all,

I'm trying to make slib work with DrScheme 200. I've put slib
directory into plt collects and I've done the following in
DrScheme:
Welcome to DrScheme, version 200.
Language: Graphical (MrEd, includes MzScheme).
> (require (lib "load.ss" "slibinit"))
> (require 'new-catalog)
#f
> (load (build-path (collection-path "slib") "DrScheme.init"))
. . reference to undefined identifier: require-library

Any idea of what might be happening?

Best regards,
-- 
Paulo J. Matos : pocm(_at_)mega.ist.utl.pt
Instituto Superior Tecnico - Lisbon    
Software & Computer Engineering - A.I.
 - > http://mega.ist.utl.pt/~pocm 
 ---	
	Yes, God had a deadline...
		So, He wrote it all in Lisp!