If you look right before the commented section, you can see the letter c. Just remove that.
ajkatz083:
c/*
Esplora KartThis sketch turns the Esplora into a PC game pad.
It uses the both the analog joystick and the four switches.
By moving the joystick in a direction or by pressing a switch,
the PC will "see" that a key is pressed. If the PC is running
a game that has keyboard input, the Esplora can control it.The default configuration is suitable for SuperTuxKart, an
open-source racing game. It can be downloaded from
http://supertuxkart.sourceforge.net/ .Created on 22 november 2012
By Enrico Gueli enrico.gueli@gmail.com
*/
After removing the c, the code compiled for me, so I am not sure why your's does not compile. I am using a different version of arduino though. Just remove the c and recompile. See if it compiles.