How to specify relative search path in S-Function builder APP?

I would like to specify a relative source code search path using Simulink S-function Builder App, however, there's only absolute path examples given on this documentation page: Build S-Functions Automatically Using S-Function Builder - MATLAB & Simulink (mathworks.com)

How can I specify a search path that's relative to

• the current Simulink model path?
• the current Simulink project path?

Answer 1

[Hua Bai]

I think we can set the environment variable in MATLAB and add ENV_PATH to s-function builder to do that.

Use the sfunction builder in the screenshot as the example,

0) set the environment variable in MATLAB command window

>> setenv("PROJROOT", 'path to your project');

1) add a "ENV_PATH" using the dropdown menu of "Insert Path" button which is located in the toolstrip

2) Set the value of new ENV_PATH to "$PROJROOT" in the bottom Libraries table