Chris Anderson commented on Jani Hirvinen's blog post 'ArduCopter Beta 2 release--GPS position hold, altitude hold and more!'

Chris Anderson commented on Jani Hirvinen's blog post 'ArduCopter Beta 2 release--GPS position hold, altitude hold and more!'
What version of Arduino are you using? Wire.h is an Arduino library, not an APM one.   If you're not using Arduino 21, download it and that should solve your problem.

Source: http://diydrones.com/xn/detail/705844:Comment:239415?xg_source=activity

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