If you have multiple MATLAB®-supported compilers for a language installed on your system, MATLAB selects one as the default compiler. You can change the default using the mex -setup command. The compiler you choose remains the default until you call mex -setup to select a different default.
For example, to change the default C compiler at the MATLAB command prompt, type:
mex -setup c
If you have multiple C compilers, MATLAB displays a message with links to set up a different compiler. If you do not specify the language argument c, MATLAB displays links to the other supported languages. Select a link to change the default.
If you call mex -setup from an operating system prompt, MATLAB displays messages with the appropriate mex command syntax. Copy this statement and paste the command in the system prompt.