libevent

yum erase libevent*
wget https://github.com/downloads/libevent/libevent/libevent-2.0.21-stable.tar.gz
tar xzvf libevent-2.0.21-stable.tar.gz
cd libevent-2.0.21-stable
make clean
./configure --prefix=/usr
make
make install

ln -s /usr/lib/libevent* /usr/lib64/