CMake Error: Could not find CMAKE_ROOT

CMake Error: Could not find CMAKE_ROOT !!!
CMake has most likely not been installed correctly.
Modules directory not found in
/usr/local/bin/cmake
cmake version 3.2.1

机子原本装了一个cmake  
后来提示版本太低，于是又装了这个 就报些错误

1. echo $CMAKE_ROOT

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为空

执行

1. export CMAKE_ROOT=/usr/local/bin/

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