monotouch compiling monotouch-bindings facebook api

I need the facebook api wrapper from the monotouch-bindings, so I've downloaded from github the whole package of the monotouch-bindings.

I cannot compile the facebook dll (I'm doing it on a macosx 10.8.3).

The make command from the folder monotouch-bindings-master/facebook gives me an error:

git clone git@github.com:facebook/facebook-ios-sdk.git Cloning into 'facebook-ios-sdk'... Permission denied (publickey). fatal: Could not read from remote repository.  Please make sure you have the correct access rights and the repository exists. make[1]: *** [facebook-ios-sdk] Error 128 make: *** [build-binding] Error 2 

I also tried with sudo make but I get the same error. I've checked if the github.com:facebook/facebook-ios-sdk.git exists and it seems it does exist.

Source: http://stackoverflow.com/questions/17488940/monotouch-compiling-monotouch-bindings-facebook-api

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