curl -O http://www.monkey.org/~provos/libevent-1.1a.tar.gz
tar zxf libevent-1.1a.tar.gz
cd libevent-1.1a
./configure
make
make install
cd ..
mv libevent-1.1a.tar.gz ../installed/
curl -O http://www.danga.com/memcached/dist/memcached-1.1.12.tar.gz
tar zxf memcached-1.1.12.tar.gz
cd memcached-1.1.12
./configure
make
make install
mv memcached-1.1.12.tar.gz ../installed

Then add /usr/local/lib to LD_LIBRARY_PATH in your .bash_profile
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib
export LD_LIBRARY_PATH

Then test:
memcached -m 512 -u nobody -vv

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