GTest: FindPackageHandleStandardArgs.cmake:137 (message): Could NOT find GTest
GTest: FindPackageHandleStandardArgs.cmake:137 (message): Could NOT find GTest
## Problem description
```sh
CMake Error at /usr/share/cmake-3.10/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
Could NOT find GTest (missing: GTEST_LIBRARY GTEST_MAIN_LIBRARY)
Call Stack (most recent call first):
/usr/share/cmake-3.10/Modules/FindPackageHandleStandardArgs.cmake:378 (_FPHSA_FAILURE_MESSAGE)
/usr/share/cmake-3.10/Modules/FindGTest.cmake:196 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
CMakeLists.txt:39 (find_package)
-- Configuring incomplete, errors occurred!
See also "/home/yubao/data/project/slambook2/myslam/build/CMakeFiles/CMakeOutput.log".
```
## My Environment
- Ubuntu 18.04
- Cmake: v3.10
- Cmake file
```sh
find_package(GTest REQUIRED)
```
## Solution
```sh
export GTEST_ROOT=/home/yubao/data/software/gooltest
```
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