title: CMake can't find freeglut-3.0.0
body: <p>Freeglut-3.0.0 is build with cmake (MinGW makefiles) and mingw and then successfully installed with <code>mingw32-make install</code> to <code>C:/Program Files (x86)/freeglut</code>.</p>
  
  <p>My <code>CMakeLists.txt</code> is:</p>
  
  <pre><code>    cmake_minimum_required(VERSION 3.7)
  
      project(math_tests)
  
      set(TESTS_SOURCES tests.cpp gl_core_3_3.c)
      set(CMAKE_CXX_STANDARD 11)
  
      # GLUT
      find_package(GLUT REQUIRED)
      include_directories(${GLUT_INCLUDE_DIR})
      if(NOT GLUT_FOUND)
          message(ERROR "GLUT not found!")
      endif(NOT GLUT_FOUND)
  
      # OpenGL
      find_package(OpenGL REQUIRED)
      include_directories(${OpenGL_INCLUDE_DIRS})
      link_directories(${OpenGL_LIBRARY_DIRS})
      add_definitions(${OpenGL_DEFINITIONS})
      if(NOT OPENGL_FOUND)
          message(ERROR "OPENGL not found!")
      endif(NOT OPENGL_FOUND)
  
      add_executable(tests ${TESTS_SOURCES})
      target_link_libraries(tests math ${GLUT_LIBRARIES} ${OPENGL_LIBRARIES})
  </code></pre>
  
  <p>Now CMake prints error: <code>Could NOT find GLUT (missing: GLUT_glut_LIBRARY).</code></p>
  
  <p>I can't figure out what I am doing wrong.</p>