For a general introduction please read:
https://sourceforge.net/docman/displ...768&group_id=1
To get the Phex source look at:
https://sourceforge.net/cvs/?group_id=27021
For windows use the tool WinCVS from wincvs.org to get access.
But be aware that you only get the most current Java source. To build a release you need jakarta-ant, a Java Development Kit. And a bit of Java knowledge would help too.
Gregor