with MATLAB 2020a or earlier. One  alternative is to install the supported compiler of the MATLAB version  in use (see </span><a href = "https://www.mathworks.com/support/requirements/previous-releases.html"><span style=' text-decoration: underline;'>here</span></a><span>) and then re-run </span><span style=' font-family: monospace;'>install_mex</span><span> (the supported compiler is used if available). Alternatively, you can try one of solutions presented </span><a href = "https://www.mathworks.com/matlab