Installation courier-authlib
# tar -xjf courier-authlib-0.57.tar.bz2
# cd courier-authlib-0.57
# ./configure --with-redhat
# make
# make install
# make install-migrate
# make install-configure
# cp courier-authlib.sysvinit /etc/rc.d/init.d/courier-authlib
# chmod 755 /etc/rc.d/init.d/courier-authlib
# chkconfig --add courier-authlib
# chkconfig courier-authlib on

More...