Why does Accelerator Mode not include file(s) provided in the custom code configurations?

I have a model which includes an S-function block that requires certain libraries. This libraries are included in the "Code Generation > Custom Code" section. The model is not able to link the associated files when running in accelerator mode, but works fine in rapid accelerator mode. I see an error such as:

====================== Error below ======================

fatal error C1083: Cannot open include file: 'myHeader.h': No such file or directory

Answer 1

[MathWorks Support Team]

We have identified two ways of having your required files linked while running in accelerator mode. I have listed these below:

1. Manually edit the makeInfo.includePath and makeInfo.sources section of the file "libs\timesn\rtwmakecfg.m" to reflect the following:

makeInfo.includePath = {pwd};
makeInfo.sources = {'filename1', 'filename2'};

Note: if you have a custom S-function created without the S-function builder, you may need to create the rtwmakecfg.m manually and put it in the same directory as the S-function itself. To have an additional include directory, the function would look like:

function makeInfo = rtwmakecfg()

makeInfo.Name        = 'MyCustomConfig';
makeInfo.includePath = {'YOUR_PATH_NAME'};

end

2. Build the S-Function using S-Function builder block and under the libraries pane, include the following:

...\filename1

...\filename2

Note: include the full path to the source files

Note: define the input and output data types under the data properties pane