For those of you who might have downloaded the game, I've put a file up that addresses building farms in any region when you have the Agriculture advance.  To use it, simply copy everything in the zip right over whatever you have already installed.

Install and source will be updated Sunday if all goes well.  I am going to see if I can get this thing working on Mono tomorrow in my spare time - which ain't much at all. 

Original install and source is yesterday's news and is over there if you need it.  :-)