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I cannot get the game porting kit installed. After I install the kit (with: brew -v install apple/apple/game-porting-toolkit) it shows an error message. I think it has todo with the step before. When I want to "apple tap" (brew tap apple/apple http://github.com/apple/homebrew-apple) there is no answer, it just moves to the next line. Is it only me, or is there a solution ? Thank you