I downloaded the arduino source and tried to build on a Windows XP
in a cygwin environment.
I receive the following error message.
c:/cygwin/home/rhinerfeld/arduino/app/preproc/PdePreprocessor.java:32:8:32:21:
Semantic Error: You need to modify your classpath,sourcepath,bootclasspath, and /or extdirs setup. Jikes could not find package "processing.app"
Try running make.sh again. Sometimes it seems to require two passes.