安装更新的cmake
cd ~/myApp
wget https://cmake.org/files/v3.6/cmake-3.6.2.tar.gz
tar xvf cmake-3.6.2.tar.gz
cd cmake-3.6.2/
./bootstrap
gmake
gmake install
/usr/local/bin/cmake --version
remove cmake // 移除原来的cmake，也可以不移除。
cd /usr/bin
cp ./cmake ./cmake.bak
cp /usr/local/bin/cmake ./
`cmake --version`
