Fail to install rTorrent on CentOS 5.4, just install transmission-daemon
libevent
wget --no-check-certificate https://sourceforge.net/projects/levent/files/libevent/libevent-2.0/libevent-2.0.22-stable.tar.gz
tar xzf libevent-2.0.22-stable.tar.gz
cd libevent-2.0.22-stable
make && sudo make install
curl
wget http://curl.haxx.se/download/curl-7.44.0.tar.gz
tar zxf curl-7.44.0.tar.gz
cd curl-7.44.0
make && sudo make install
transmission
wget http://download.transmissionbt.com/files/transmission-2.84.tar.xz
yum install -y xz
unxz transmission-2.84.tar.xz
cd transmission-2.84
export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
export LIBS="-pthread -lm -lz -ldl -lutil"
export LIBCURL_LIBS="-I/usr/local/lib -lcurl"
export LIBEVENT_LIBS="-I/usr/local/lib -levent"
make && sudo make install
check config at $HOME/.config/transmission-daemon
transmission-remote --add xxx.torrent # add seed
transmission-remote -st # check status
transmission-remote -l # list