title: How to set GoogleTest variables GTEST_LIBRARY GTEST_INCLUDE_DIR and GTEST_MAIN_LIBRARY to CMake on Windows?
body: <p>There is a project that was developed for linux environment. Now I am trying to build this on windows using CMake.</p>
  
  <p>I keep trying to build the project and always get this error:</p>
  
  <pre><code>CMake Error at C:/Program Files(x86)/CMake/share/cmake-3.3/Modules/FindPackageHandleStandardArgs.cmake:148 (message):
  Could NOT find GTest (missing: GTEST_LIBRARY GTEST_INCLUDE_DIR GTEST_MAIN_LIBRARY)
  Call Stack (most recent call first):
  C:/Program Files(x86)/CMake/share/cmake-3.3/Modules/FindPackageHandleStandardArgs.cmake:388 (_FPHSA_FAILURE_MESSAGE)
  C:/Program Files(x86)/CMake/share/cmake-3.3/Modules/FindGTest.cmake:204 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  C:/Users/awy9/git/cmake_modules/modules/SigeoGTest.cmake:21 (find_package)  
  C:/Users/awy9/git/cmake_modules/modules/SigeoInit.cmake:29 (include)  
  CMakeLists.txt:12 (include)
  </code></pre>
  
  <p>How can I set these variables to work on this project now on Windows?</p>