This page is linked to another and will outline the steps to get and compile SmartBody.
Current svn command and link
svn co https://smartbody.svn.sourceforge.net/svnroot/smartbody/trunk smartbody
To Compile for Windows follow the steps in the guide that basically just say to use visual studio to open the solution and build the project.
For Linux it was a little more complicated. I prefer to work on Linux (Ubuntu) for my work so I ventured on writing a script to setup all of the dependencies.
Here is a script I wrote to setup all the dependencies for SmartBody on Ubuntu 12.04.