Cannot properly install drscheme in AMD64

[Avinash Meetoo]

I've upgraded from Breezy to Dapper and I keep having this error message whenever I use aptitude to install a new package:

Setting up mzscheme (209-9ubuntu1) ...
Completing install...This program should be used again only when the PLT tree was moved.
You should use bin/setup-plt instead.
finished
Building MzScheme zo files: This can take a LONG time (10 minutes in some cases!)
finished.
Cataloging SLIB routines...
reference to undefined identifier: with-load-pathname
dpkg: error processing mzscheme (--configure):
 subprocess post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of drscheme:
 drscheme depends on mzscheme (= 1:209-9ubuntu1); however:
  Package mzscheme is not configured yet.
dpkg: error processing drscheme (--configure):
 dependency problems - leaving unconfigured
Setting up libsdl1.2debian-alsa (1.2.9-0.0ubuntu1) ...

Errors were encountered while processing:
 mzscheme
 drscheme
E: Sub-process /usr/bin/dpkg returned an error code (1)
A package failed to install. Trying to recover:
Setting up mzscheme (209-9ubuntu1) ...
Completing install...This program should be used again only when the PLT tree was moved.
You should use bin/setup-plt instead.
finished

[Avinash Meetoo (avinash)]

The problem is related to slib. I've solved it by uninstalling slib (which was not used by any other package - strange...)