升级Cmake（不用卸载原有的版本）

1、下载需要的版本

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1	https://cmake.org/download/

2、解压、编译并安装到制定目录，修改环境变量

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tar -zxvf cmake-3.20.0-rc1.tar.gz cd cmake-3.20.0-rc1 ./bootstrap --prefix=/opt/cmake-install make make install     sudo gedit ~/.bashrc #把下面两个命令加入~/.bashrc中 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