[plt-scheme] Odd error message: is 4.0 really too old? :)

I'm currently running 4.0-svn11jun2008, and after trying to recompile
some source, I'm seeing the following error:

######################################################################################
setup-plt:   require: PLaneT could not find the requested package:
Server had no matching package: Your version of PLT Scheme is too old
to run the specified package in: (planet "combinators.ss" ("cce"
"combinators.plt" 1 (= 1)))
######################################################################################

This is showing up because Galore has a dependency on the combinators
library, which isn't available for 4.0.

(I hacked up my local copy of Galore and SchemeUnit 1.2 to make things
run again, and will send my changes upstream tomorrow...)