nvcc can't find mex.h

Hi guys, I'm trying to learn a bit of mex programming but can't seem to compile this simple example. The error I receive is:

>> system('nvcc -c AddVectors.cu')

nvcc warning : The 'compute_10' and 'sm_10' architectures are deprecated, and may be removed in a future release.

AddVectors.cu:2:10: fatal error: 'mex.h'

      file not found

#include "mex.h"

         ^
1 error generated.

ans =

     1

I'm guessing there's something missing from the paths where MATLAB is searching for mex.h, but I can't figure out where mex.h is meant to be exactly. I'm running MATLAB 2013b on OS X 10.9 and have Xcode 5.1 beta installed. Thanks for any assistance.