Referencing External .class Files In Classpath

[Stephen Morrison]

Hi,

I'm trying to build an Ant project that uses some Apple Cocoa classes.  
These are stored as .class files and not as jars.  They reside in a 
completely different folder to my project.  I can compile and run my 
program by referencing these from the command line as follows:

javac -classpath /System/Library/Java:. MyProgram.java

java -classpath /System/Library/Java:. MyProgram

Is there a way I can replicate this functionality using Ant and add the 
directory (System/Library/Java) to the classpath?

I've tried solutions from the Ant documentation and the archives of 
this list but haven't been able to get anything to work yet.

Thanks in advance,
Steve.