[plt-scheme] v350 install glitch

I have to ask our sysadmin people to install PLT Scheme on our 
undergraduate computing environment, and they are having problems with 
v350. They get the following error message:

./setup-plt: test: argument expected

The sysadmin says:

> Followed install instructions for drscheme-350 and specified a single
> directory for installing everything. The script would then unpack all the
> files into the specified directory.  In this case a directory called 
> /software/drscheme-350/distribution. Then proceded to the bin directory
> to finish setup as per usual (i.e. setup-plt).  The failure is in the
> test for the while.  The "-L" test just looks to see if the file exists
> and is a link.

Suggestions? Thanks. --PR