I've downloaded the dot scheme library (<a href="http://www.rivendell.ws/dot-scheme/">http://www.rivendell.ws/dot-scheme/</a>), 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!