MacOS X Big Sur OpenGL import error

[woyczek]

MCEdit Unified bug report template. For MCEdit 2.0 bugs see here : https://github.com/mcedit/mcedit2
MCEdit Version: latest release (1.5.6.0 for minecraft 1.8-1.11)
Minecraft Version the world was last opened in: n/a (startup)
Operating System: MacOS Big Sur

Console log:

Could not create 'splash' file: [Errno 30] Read-only file system: u'/private/var/folders/v9/5…/…/d/mcedit.app/Contents/Resources/splash'
…/…
File "…/…mcedit.app/Contents/Resources/lib/python2.7/OpenGL/platform/darwin.py", line 41, in GL

ImportError: ('Unable to load OpenGL library', 'dlopen(OpenGL, 10): image not found', 'OpenGL', None)