I have released a new version of SmartBody for Linux based on revision 5924.
The Linux SDK includes all source code for SmartBody, the SmartBody tool and viewer (sbgui), as well as integration samples for the Ogre and Irrlicht engines.
This SDK targets the Ubuntu 12.04 and will build out-of-the-box once the set of dependent packages are installed (see the README.txt). However, I expect that this will also build on other flavors and versions of Linux as well. The SDK is a gzipped tarball.
A binary and source SDK for Windows has already been released, and a similar binary and source SDK for OSX will follow soon.
You can download it here.