This is a Kerbal Space Program mod that provides a radar altimeter for use in game.
To build it from scratch, you will need MonoDevelop or VisualStudio.
http://wiki.kerbalspaceprogram.com/wiki/Setting_up_MonoDevelop http://wiki.kerbalspaceprogram.com/wiki/Setting_up_Visual_Studio
Follow the steps from those links and add the source from the source directory of this project to produce an updated binary.