FreeRADIUS-WPE (Wireless Pwnage Edition)
By Brad Antoniewicz and Josh Wright
[email protected]

More information here:
http://www.willhackforsushi.com/?page_id=37
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From Source:

wget ftp://ftp.freeradius.org/pub/radius/old/freeradius-server-2.1.11.tar.bz2
wget http://www.opensecurityresearch.com/files/freeradius-wpe-2.1.11.patch

tar -jxvf freeradius-server-2.1.11.tar.bz2
cd freeradius-server-2.1.11
patch -p1 < freeradius-wpe-2.1.11.patch

./configure
make
sudo make install

You may also have to:
cd /usr/local/etc/raddb/certs/
./bootstrap

Using Binary:

If you're using the .deb, it has been tested with BackTrack 5 R1, but will likely work with other versions and Ubuntu/Debian. 

wget http://www.opensecurityresearch.com/files/freeradius-server-wpe_2.1.11-1_i386.deb

sudo dpkg --install freeradius-server-wpe_2.1.11-1_i386.deb
sudo ldconfig 

and just to confirm:
radiusd -v (make sure its 2.1.11)