[plt-scheme] Linking native code to MzScheme

When I follow the instructions for compiling code to native 
object code and linking the result to a MzScheme executable, I 
find that most of the steps don't work. There is mo mzmake in 
the mzscheme directory, and if I run make ee-main I get all 
sorts of errors. Has the process changed in recent versions of 
MzScheme? Is there any way to get this to work? I'm using the 
exp-tagged cvs tree, checked out today. Are there any older 
versions where this does work?