Cause undead horses to naturally spawn on bukkit servers. For more info go to http://dev.bukkit.org/bukkit-plugins/unlivinghorsies/

To compile, make sure you are running at least java 1.7 and Apache Maven. Download the contents of this repo, then, from the command line, navigate to the where you've stored the contents of this repo and run

mvn clean package

From the Command Line. The result will be located in the target directory.