升级Cmake（不用卸载原有的版本）

1、下载需要的(版本)[https://cmake.org/download/]

https://cmake.org/download/

2、解压、编译并安装到制定目录，修改环境变量

tar -zxvf cmake-3.20.0-rc1.tar.gz
cd cmake-3.20.0-rc1
./bootstrap --prefix=/opt/cmake-install
make
make install

 配置环境变量

sudo gedit ~/.bashrc

 添加下面两行

export PATH=/opt/cmake-install/bin:$PATH

export CMAKE_PREFIX_PATH=/opt/cmake-install:$CMAKE_PREFIX_PATH

保存一下并运行

source ~/.bashrc