Installing from the SVN is very similar to installing from source, but you'll have the chance to easily update your FreeLing to the latest development version.
sudo apt-get install build-essential automake libtool subversion
If you use a distribution different than Debian or Ubuntu, these packages may have different names. Use your package manager to locate and install the appropriate ones.
mkdir mysrc
cd mysrc
svn checkout http://devel.cpl.upc.edu/freeling/svn/latest/freeling
svn checkout http://devel.cpl.upc.edu/freeling/svn/latest/omlet
svn checkout http://devel.cpl.upc.edu/freeling/svn/latest/fries
cd fries
aclocal; libtoolize; autoconf; automake -a
cd ../omlet
aclocal; libtoolize; autoconf; automake -a
cd ../freeling
aclocal; libtoolize; autoconf; automake -a
cd ..
cd fries
./configure && make
sudo make install
cd ../omlet
./configure && make
sudo make install
cd ../freeling
./configure && make
sudo make install
If you keep the svn directories, you will be able to update to the latest version at any moment:
cd freeling
svn update
./configure && make
sudo make install
Obviously, you can also update fries or omlet versions in the same way.