在CLion中使用OpenGL时未定义的引用错误

所以，我使用freeglut尝试做一些openGL的东西，但我不断得到错误说引用是未定义的:

"C:Program Files (x86)JetBrainsCLion 2016.2.1bincmakebincmake.exe" --build C:UsersNick.CLion2016.2systemcmakegeneratedcs455opengl-9b23e7f09b23e7f0Debug --target all -- -j 4
Scanning dependencies of target cs455openGL
[ 50%] Building CXX object CMakeFiles/cs455openGL.dir/main.cpp.obj
[100%] Linking CXX executable cs455openGL.exe
CMakeFilescs455openGL.dir/objects.a(main.cpp.obj): In function `Z4initv':
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:12: undefined reference to `glClearColor@16'
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:13: undefined reference to `glMatrixMode@4'
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:14: undefined reference to `glLoadIdentity@0'
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:15: undefined reference to `glOrtho@48'
CMakeFilescs455openGL.dir/objects.a(main.cpp.obj): In function `Z7displayv':
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:20: undefined reference to `glClear@4'
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:21: undefined reference to `glColor3f@12'
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:22: undefined reference to `glVertex3f@12'
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:23: undefined reference to `glVertex3f@12'
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:24: undefined reference to `glVertex3f@12'
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:25: undefined reference to `glVertex3f@12'
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:26: undefined reference to `glEnd@0'
C:/Users/Nick/ClionProjects/cs455opengl/main.cpp:27: undefined reference to `glFlush@0'
collect2.exe: error: ld returned 1 exit status
CMakeFilescs455openGL.dirbuild.make:95: recipe for target 'cs455openGL.exe' failed
CMakeFilesMakefile2:66: recipe for target 'CMakeFiles/cs455openGL.dir/all' failed
mingw32-make.exe[2]: *** [cs455openGL.exe] Error 1
mingw32-make.exe[1]: *** [CMakeFiles/cs455openGL.dir/all] Error 2
mingw32-make.exe: *** [all] Error 2
Makefile:82: recipe for target 'all' failed

我使用MinGW与CLion做这个项目。我以为我做对了。我将适当的文件移动到MinGW中的include文件夹、bin文件夹和lib文件夹中。然后，在cmakelists。txt:

cmake_minimum_required(VERSION 3.3)
project(cs455openGL)
find_package(OpenGL REQUIRED)
find_package(GLUT REQUIRED)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
set(SOURCE_FILES main.cpp)
add_executable(cs455openGL ${SOURCE_FILES})
link_directories(${OPENGL_gl_LIBRARY})
target_link_libraries(cs455openGL libfreeglut.a libfreeglut_static.a)

我链接的库是freeglut附带的唯一库文件。我一直在网上寻找答案，似乎没有人遇到过这种情况。

那么，我错过了什么?在编译之前，CLion不会显示任何错误。我甚至可以进入freeglut提供的头文件中的函数。那么，为什么这些函数没有在我的程序中定义?