XFree and WinCE

Hello.

I found this group when I was looking for information about using X 
programs with WindowsCE.
That search took me here 
http://www.rainer-keuchel.de/wince/xfree-wince.html where I found a lot 
of binaries of ported old X versions to several different platforms. 
I'll do like to take a look at this and continue the development but I 
didn't find the source files.
Does anyone know where can I grab them?

Thanks.

Adilson.