[plt-scheme] Installing PLAI on DrScheme 352

Hello,
While trying to install PLAI[1] ond DrScheme 352 I've got the following 
messages and errors:

setup-plt: Setup version is 352
setup-plt: Main collection path is /usr/lib/plt/collects
setup-plt: Collection search path is 
setup-plt:   /home/pupeno/.plt-scheme/352/collects
setup-plt:   /usr/lib/plt/collects
setup-plt: Unpacking PLAI from /usr/tmp/tmp1156450471-1043214700.plt
setup-plt:   making directory plai in /home/pupeno/.plt-scheme/352/collects/
setup-plt:   unpacking datatype.ss 
in /home/pupeno/.plt-scheme/352/collects/plai/
setup-plt:   unpacking doc.txt in /home/pupeno/.plt-scheme/352/collects/plai/
setup-plt:   unpacking info.ss in /home/pupeno/.plt-scheme/352/collects/plai/
setup-plt:   unpacking plai-advanced.ss 
in /home/pupeno/.plt-scheme/352/collects/plai/
setup-plt:   unpacking plai-beginner.ss 
in /home/pupeno/.plt-scheme/352/collects/plai/
setup-plt:   unpacking plai-intermediate.ss 
in /home/pupeno/.plt-scheme/352/collects/plai/
setup-plt:   unpacking plai-large.gif 
in /home/pupeno/.plt-scheme/352/collects/plai/
setup-plt:   unpacking plai-pretty-big.ss 
in /home/pupeno/.plt-scheme/352/collects/plai/
setup-plt:   unpacking plai-reader.ss 
in /home/pupeno/.plt-scheme/352/collects/plai/
setup-plt:   unpacking plai-small.gif 
in /home/pupeno/.plt-scheme/352/collects/plai/
setup-plt:   unpacking plai-tool.ss 
in /home/pupeno/.plt-scheme/352/collects/plai/
setup-plt:   making directory private 
in /home/pupeno/.plt-scheme/352/collects/plai/
setup-plt:   unpacking core-utils.ss 
in /home/pupeno/.plt-scheme/352/collects/plai/private/
setup-plt:   unpacking datatype-core.ss 
in /home/pupeno/.plt-scheme/352/collects/plai/private/
setup-plt:   unpacking datatype.ss 
in /home/pupeno/.plt-scheme/352/collects/plai/private/
setup-plt:   unpacking test-harness.ss 
in /home/pupeno/.plt-scheme/352/collects/plai/
setup-plt: Compiling .zos used by PLAI
setup-plt:   in /home/pupeno/.plt-scheme/352/collects/plai/
setup-plt:   in /usr/lib/plt/collects/lang/private/
delete-file: cannot delete 
file: "/usr/lib/plt/collects/lang/private/compiled/teach.zo" (Permission 
denied; errno=13)
setup-plt: 
Updating /home/pupeno/.plt-scheme/352/collects/info-domain/compiled/cache.ss
setup-plt: Done setting up
setup-plt: 
setup-plt: Error during Compiling .zos for PLAI 
(/home/pupeno/.plt-scheme/352/collects/plai)
setup-plt:   delete-file: cannot delete 
file: "/usr/lib/plt/collects/lang/private/compiled/teach.zo" (Permission 
denied; errno=13)

Any ideas what am I doing wrong for it to try to delete installed stuff ?

Thanks.
-- 
Pupeno <pupeno at pupeno.com> (http://pupeno.com)

[1] http://www.cs.brown.edu/~sk/Publications/Books/ProgLangs/
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