Download CMake 2.8.10.2 from http://www.cmake.org/cmake/resources/software.html#latest
cd /usr/local
tar -zxf cmake-2.8.10.2.tar.gz
rpm -qa|grep ncurses-devel // to check if you installed ncurses-devel, if not, please install this firstly
rm -f cmake-2.8.10.2.tar.gz
cd cmake-2.8.10.2
./configure
make
make install
cd ..
mv cmake-2.8.10.2 cmake

vi /etc/profile

Put below 2 lines into the bottom line of /etc/profile:

PATH=/usr/local/cmake/bin:$PATH

export PATH

source /etc/profile
echo $PATH // to check if cmake in the PATH.
cmake –version // to check if the version is right, should be cmake version 2.8.10.2

DONE~~~

https://github.com/jackywei/HOW-TO-BUILD-HHVM-WiKi/wiki/Build-&-Install-CMake-2.8.10.2-in-CentOS6.3