Download the sources from: http://developer.berlios.de/projects/radiusclient-ng/ Untar the source tarball. root@localhost:/usr/local/src# tar xvfz radiusclient-ng-0.5.5.1.tar.gz Compile and install the library. root@localhost:/usr/local/src# cd radiusclient-ng-0.5.5.1 root@localhost:/usr/local/src/radiusclient-ng-0.5.5.1# ./configure root@localhost:/usr/local/src/radiusclient-ng-0.5.5.1# make root@localhost:/usr/local/src/radiusclient-ng-0.5.5.1# make install