c++ - ld: library not found for -lGL on Mac

Question

从https://github.com/openglredbook/examples 下载了OpenGL编程指南的样例代码，但是运行的时候报错，在build文件夹运行cmake .. 报错如下(运行环境是Mac)：

-- Try OpenMP C flag = [-fopenmp=libomp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP C flag = [ ]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP C flag = [-fopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP C flag = [/openmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP C flag = [-Qopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP C flag = [-openmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP C flag = [-xopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP C flag = [+Oopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP C flag = [-qsmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP C flag = [-mp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [-fopenmp=libomp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [ ]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [-fopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [/openmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [-Qopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [-openmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [-xopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [+Oopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [-qsmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [-mp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Could NOT find OpenMP (missing:  OpenMP_C_FLAGS OpenMP_CXX_FLAGS)
-- Using Cocoa for window creation
-- Using NSGL for context creation
-- Building GLFW only for the native architecture
-- Configuring done
-- Generating done

然后运行make 报错如下：

[  6%] Built target vermilion
[ 15%] Built target glfw
[ 16%] Linking CXX executable ../bin/12-imageprocessing
ld: library not found for -lGL
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [../bin/12-imageprocessing] Error 1
make[1]: *** [CMakeFiles/12-imageprocessing.dir/all] Error 2
make: *** [all] Error 2

在网上搜了好久但是都没有解决，大家知道这是怎么回事吗？

Answer 1

問題已解決，CMakeLists.txt 檔案26行https://github.com/openglredbook/examples/blob/master/CMakeLists.txt#L26 處，刪除GL rt dl即可make成功。

Answer 2

我去下載了這個例子，在windows下能成功運行。
如圖：
cmake 的make過程 選擇的是visual2013 官方也說了visual 2013是可以的

使用visual studio 2013 開啟專案編譯

忽略這些不必要的錯誤，開啟bin資料夾，也可看到有很多可執行檔

開啟這些執行檔

因為你的是mac平台，官網也說了使用cmake Unix makefiles 也是可以成功運行的。你可以跟我一樣去官網下載一個cmake的gui版，你選擇Mac OSX。然後輸入正確路徑，配置你要用到的generator，因為我要用到visual 2013 於是我選擇了visual 2013.你 要根據你自己的情況選擇。

然後打開你的generator去make整個項目，最後會在bin目錄下產生可執行檔。完成！

Answer 3

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