[PyQt5/OpenGL/Anaconda] OSError: dlopen(OpenGL, 0x000A), ImportError: ('Unable to load OpenGL library', "dlopen(OpenGL, 0x000A) 해결방법

environment.yml 파일을 활용해서 anaconda 가상환경을 구성하던 중에 화려한 에러가 발생했다. 이 에러가 발생했을 때는 openGL이고 뭐고 하나도 모를 때라서 엥? 왜 안되지? 상태였다. 전문을 첨부한다...

OSError: ("dlopen(OpenGL, 0x000A): tried: '/Users/user/opt/anaconda3/envs/environment/lib/OpenGL' (no such file), '/Users/user/opt/anaconda3/envs/environment/lib/OpenGL' (no such file), '/Users/user/opt/anaconda3/envs/environment/lib/OpenGL' (no such file), '/Users/user/opt/anaconda3/envs/environment/lib/python3.7/lib-dynload/../../OpenGL' (no such file), '/Users/user/opt/anaconda3/envs/environment/lib/OpenGL' (no such file), '/Users/user/opt/anaconda3/envs/environment/lib/OpenGL' (no such file), '/Users/user/opt/anaconda3/envs/environment/bin/../lib/OpenGL' (no such file), 'OpenGL' (no such file), '/usr/local/lib/OpenGL' (no such file), '/usr/lib/OpenGL' (no such file), '/Users/user/Desktop/PanoAnnotator2/OpenGL' (no such file)", 'OpenGL', None)

ImportError: ('Unable to load OpenGL library', "dlopen(OpenGL, 0x000A): tried: '/Users/user/opt/anaconda3/envs/environment/lib/OpenGL' (no such file), '/Users/user/opt/anaconda3/envs/environment/lib/OpenGL' (no such file), '/Users/user/opt/anaconda3/envs/environment/lib/OpenGL' (no such file), '/Users/user/opt/anaconda3/envs/environment/lib/python3.7/lib-dynload/../../OpenGL' (no such file), '/Users/user/opt/anaconda3/envs/environment/lib/OpenGL' (no such file), '/Users/user/opt/anaconda3/envs/environment/lib/OpenGL' (no such file), '/Users/user/opt/anaconda3/envs/environment/bin/../lib/OpenGL' (no such file), 'OpenGL' (no such file), '/usr/local/lib/OpenGL' (no such file), '/usr/lib/OpenGL' (no such file), '/Users/user/Desktop/PanoAnnotator2/OpenGL' (no such file)", 'OpenGL', None)

어떤 과정으로 발생한 오류인지는 아래 커멘드를 참고해주세요...

conda env create -f ./{environmental yml file path}
conda env list 
conda activate {environment name}
python3 ./MainWindow.py
// => error occur

• ../anaconda3/envs/pano_annotator/lib/python3.7/site-packages/OpenGL/platform/ctypesloader.py 파일에서
• _loadLibraryWindows 함수의 try 하단 fullName을 아래 코드와 같이 바꾸면 해결된다.

def _loadLibraryWindows(dllType, name, mode):
    """Load a given library for Windows systems

    returns the ctypes C-module object
    """
    fullName = None
    try:
				### rewriting full name here
        fullName = '/System/Library/Frameworks/OpenGL.framework/OpenGL'
        if fullName is not None:
            name = fullName
        elif os.path.isfile( os.path.join( DLL_DIRECTORY, name + '.dll' )):
            name = os.path.join( DLL_DIRECTORY, name + '.dll' )
    except Exception as err:
        _log.info( '''Failed on util.find_library( %r ): %s''', name, err )
        # Should the call fail, we just try to load the base filename...
        pass
    try:
        return dllType( name, mode )
    except Exception as err:
        err.args += (name,fullName)
        raise