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The original "bumblebee" is no longer supported or being worked on. It got replaced by the following two projects:
https://github.com/MrMEEE/ironhide (By the original creator of bumblebee)
or...

Just a note for anyone thinking of using xorg-edgers, doing so will mean you can't use Unity 3D, because xorg-edgers doesnt package the gesture/multitouch (utouch) in their x server package, because...

Personally I don't mind if they replace X when Wayland has become stable enough for daily use.
X is 26 years old ('84), I'm sure the code base is a complete mess now of old code that's kept around...