Assumptions: you have the scheme package such as the Mred distribution for linux (v 53) installed.

GET: the plumber directory, cs257-scheme shell script, and a copy of the dot-emacs.el this stuff is in the ~cslab/CS257/...area...

1. Put the plumber dir (in ~cslab/.../plt/collects) in the collects dir for your installation. For example, /usr/share/scheme/plt/collects is where i put it on mine.
2. Edit the cs257-scheme script to reflect the locations of mred and mzscheme.
   e.g located in /usr/share/scheme/plt/bin on mine.

   I put the script in /usr/share/scheme to make easy access for other users too, where /usr is exported r+x for all users, but you could very well just put it in your personal scheme directory or something.

3. Set up your .emacs for program-name to call cs257-scheme script which will in turn call the scheme program mred with the graphics package if X-windows is installed else just mzscheme runtime with no graphics.
   Snippet from my .emacs that does this:

   ; will call either mred or mzscheme depending on if 
   ; X-windows is running
   (setq scheme-program-name "/usr/share/scheme/cs257-scheme")
   
   ; "/usr/share/scheme/plt/bin/mzscheme") ; non-graphic scheme --- 2/3/99
   

   If you haven't already, make sure mzscheme can run by itself -> comment the call to the script and uncomment the line calling mzscheme.
4. Have fun