The SDK for the AR.Drone & AR.Drone 2 is no longer officially supported: We still distribute the last version of the source and the documentation, but we don't maintain it for "newer" systems (as an example, 64bits versions of linux are not supported by the AR.Drone SDK).
The Bebop 2 is the "suggested" drone for that kind of work. It works with the newer (and supported !) ARSDK 3 (you can find the doc here, and it includes linux samples), and has better flight & battery characteristics than the Bebop 1 (and even more improvements when compared to the AR.Drones)
If you really want to stick with the AR.Drones, you may be able to find non-official versions of the SDK updated for newer OSes, but we (Parrot) won't provide any support on these