升級Cmake（不用卸載原有的版本）

1、下載需要的版本

https://cmake.org/download/

2、解壓、編譯並安裝到制定目錄，修改環境變量

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
#把下面兩個命令加入~/.bashrc中
export PATH=/opt/cmake-install/bin:$PATH
export CMAKE_PREFIX_PATH=/opt/cmake-install:$CMAKE_PREFIX_PATH
#保存一下並運行
source ~/.bashrc