Cannot run Matcont in Matlab using my Mac computer.

When I type 'mex -setup' in Matlab command window and choose 1 after that, two errors comes up listed below.

By the way, I'm using OSX Version 10.8.5 and Matlab 2012b, I also download Xcode5. It takes me a long time to fix it, but it still doesn't work. What's wrong?

>> matcont /Applications/MATLAB_R2012b.app/bin/mex: line 305: llvm-gcc-4.2: command not found /Applications/MATLAB_R2012b.app/bin/mex: line 1326: llvm-gcc-4.2: command not found

    mex: compile of ' "BVP_LC_jac.c"' failed.

Error using mex (line 206) Unable to complete successfully.

Error in matcont (line 61) mex -largeArrayDims -O BVP_LC_jac.c;

[Jie]

Is there anyone can help me? Very appreciate!