[plt-scheme] make-extension.ss:6:4: module: identifier already imported (from a different source) in: string-upcase

I've downloaded the dot scheme library (http://www.rivendell.ws/dot-scheme/),
and I'm trying to get it to build under the current version of mzscheme
(301).   When I run build.ss, I get the following message:

"make-extension.ss:6:4: module: identifier already imported (from a
different source) at: string-upcase in: (require (lib "make.ss" "make") (lib
"process.ss") (lib "13.ss" "srfi"))"

Any ideas on how to fix this?  I'm new to plt-scheme, but I'm assuming that
there's a variable or function being imported that classes with the the name
of another variable or function.  Am I correct?  But I can't figure out from
the error message *what* variable or function name is clashing.

Any help would be appreciated.

Alternatively, I guess I could just install an older version of PLT-Scheme?

Thanks!
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.racket-lang.org/users/archive/attachments/20060418/4896a8f1/attachment.html>