Compiling on Mac OS X:
see REQUIREMENTS file too. 

you need: 
 
 - Mac OS X system
 - some of the tools from the REQUIREMENTS listing are missing:
 - developer tools: http://developer.apple.com/membership/online.html
   (join the "Online" ADC for free)

 - Mac OS X system X-Windows Library:
   http://www.darwinfo.org/pub/darwin/X11/X11R6-darwin.tar.gz

   follow the instructions for X-Windows Library installation:
   http://www.darwinfo.org/howto/x.shtml