I've downloaded the package, set up the dependencies and ran v.py.
I get this:

File "/Users/nacho/workspace/pvflip/./v.py", line 2410, in
if name == 'main': main()
^^^^^^
File "/Users/nacho/workspace/pvflip/./v.py", line 2282, in main
if not glfw.init():
^^^^^^^^^^^
File "/Users/nacho/workspace/pvflip/glfw/glfw.py", line 727, in init
res = _glfw.glfwInit()
^^^^^^^^^^^^^^^^
File "/Users/nacho/workspace/pvflip/glfw/glfw.py", line 636, in errcheck
_reraise(exc[1], exc[2])
File "/Users/nacho/workspace/pvflip/glfw/glfw.py", line 36, in _reraise
raise exception.with_traceback(traceback)
File "/Users/nacho/workspace/pvflip/glfw/glfw.py", line 615, in callback_wrapper
return func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^
File "/Users/nacho/workspace/pvflip/glfw/glfw.py", line 789, in _raise_glfw_errors_as_exceptions
raise GLFWError(message)
glfw.glfw.GLFWError: (65544) b'Cocoa: Failed to retrieve display name'

Any clue?