The source package sarl3-0.9.tar.gz can be downloaded from the sourceforge file release system http://sourceforge.net/project/showfiles.php?group_id=20790.
To install you need the following debian packages installed.
sudo apt-get install tcl8.4 ruby1.8-dev tclsh g++ gtk2.0-dev gc-dev
The process is then:
tar -xzf sarl3-0.9.tar.gz cd sarl3-0.9.tar.gz make make install
If this doesn't work the first port of call is build_config.txt which contains some variables which can be set. The build_config.txt also contains the location where the files are installed. The default setting is to install in /usr/local.
If you have any problems compiling please drop me an email and I will try to assist {rj-cole (at) sf.net}. It will also help me improve the build process.