matlab 2012b how to compile a mex file?

I recently installed matlab 2012b mac version for my mac. I want to run a script with command 'mex'. Before I did this, I entered 'mex -setup' in command line and I got

>> mex -setup

    Options files control which compiler to use, the compiler and link command
    options, and the runtime libraries to link against.

    Using the 'mex -setup' command selects an options file that is
    placed in /Users/liqian/.matlab/R2012b and used by default for 'mex'. An options 
    file in the current working directory or specified on the command line 
    overrides the default options file in /Users/liqian/.matlab/R2012b.

    To override the default options file, use the 'mex -f' command
    (see 'mex -help' for more information).

The options files available for mex are:

1: /Applications/MATLAB_R2012b.app/bin/mexopts.sh : 
    Template Options file for building gcc MEX-files

0: Exit with no changes

I chose 1, but when I run my file with mex, the following message showed:

>> build /Applications/MATLAB_R2012b.app/bin/mex: line 305: gcc-4.2: command not found /Applications/MATLAB_R2012b.app/bin/mex: line 1326: g++-4.2: command not found

    mex: compile of ' "src/xprj.cpp"' failed.

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

Error in build (line 2) mex src/xprj.cpp src/prj.cpp src/prj_fanED.cpp src/prj_fanEA.cpp src/prj_para.cpp src/img.cpp src/img_fltTV.cpp src/img_fltSTH.cpp src/cpputils.cpp

What's wrong?

Answer 1

[Walter Roberson]

http://www.mathworks.com/support/solutions/en/data/1-FR6LXJ/