linux升级cmake

如果出现如下报错，就应该升级cmake了！
CMake Error at CMakeLists.txt:1 (cmake_minimum_required):
  CMake 3.1 or higher is required.  You are running version 2.8.12.2

-- Configuring incomplete, errors occurred!

官网
可以下载各个版本的cmake: https://cmake.org/files/

升级
1.下载cmake，这里选择cmake-3.12.4，当然可以选择更新的版本：

    进入https://cmake.org/files/v3.12/
    选择cmake-3.12.4.tar.gz

2.解压后进入文件夹进行编译编译

./bootstrap
make
sudo make install

3.查看版本

cmake --version

打印如下，说明安装成功了！
cmake version 3.12.4

安装完后，发现make会出报错如下：

CMake Error: Could not find CMAKE_ROOT !!!
CMake has most likely not been installed correctly.
Modules directory not found in
/usr/local/bin
CMake Error: Error executing cmake::LoadCache(). Aborting.

hash -r

问题3
-- Could NOT find OpenSSL, try to set the path to OpenSSL root folder in the system variable OPENSSL_ROOT_DIR (missing: OPENSSL_CRYPTO_LIBRARY OPENSSL_INCLUDE_DIR) 

sudo yum install openssl-devel