scrooloose/syntastic — pull request #1153 by nestorsalceda (2014-08-02 11:37:52+00:00)
Title: Fixes duplicate syntax checker for arduino files

I'm getting the "duplicate syntax check" when opening arduino files

E605: Exception not caught: Syntastic: Duplicate syntax checker name: c/avrgcc

So I have changed the filetype for arduino /avrgcc and it's working right now :metal: