安装kalibr踩坑1：Could NOT find GTest (missing: GTEST_LIBRARY GTEST_MAIN_LIBRARY)

Could NOT find GTest (missing: GTEST_LIBRARY GTEST_MAIN_LIBRARY) 

 因为GTest虽然安装过，但是好像找不到头文件

sudo apt-get install libgtest-dev
sudo apt-get install cmake
cd
cd /usr/src/gtest
sudo cmake CMakeLists.txt 
sudo make 
sudo cp *.a /usr/lib