I looked at what was happening in the install process and noted that it was creating the spl.jar file but again permissions was the issue. Using sudo didn't make a difference when executing window, so instead I ran these:

sudo chown jharvard:students /usr/local/lib/spl.jar
sudo chown jharvard:students /usr/local/lib/libcs.a

And voila!...the window pops open with no error.

I looked at what was happening in the install process and noted that it was creating the spl.jar file but again permissions was the issue. Using sudo didn't make a difference when executing window, so instead I ran these:

sudo chown jharvard:students /usr/local/lib/spl.jar
sudo chown jharvard:students /usr/local/lib/libcs.a

Oddly, I have to execute the files from outside the src4m directory. from /usr/local/lib/ I can run sudo ~/Dropbox/src4m/window and it works.