.. _matlab_cannot_find_compiler:

Matlab Cannot Find Installed Compiler
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**Do not use ``mex -setup``.**

``mex -setup`` is used for setting the PC compiler for compiling S-functions. The embedded software compiler is set in the "Code Generation" tab in Simulink.

To select your embedded compiler:

1. Open Simulink model.
2. Click "Simulation" > "Model Configuration Parameters".
3. Expand "Code Generation" or "Real-Time Workshop".
4. Select "OpenECU compiler selection".

.. image:: matlab_cannot_find_compiler_img1.jpg

If "Code Generation" or "Real-Time Workshop" isn't visible, you may not have a licensed Simulink Coder. Contact Mathworks for assistance.

If the compiler is not in the dropdown, consider adding an environment variable for your compiler.