Why do I get error "'SS_OPTIO​N_CALL_TER​MINATE_ON_​EXIT' undeclared (first use in this function)" when trying to compile an S function ?

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I am trying to compile the source code of an s function with the option SS_OPTION_CALL_TERMINATE_ON_EXIT inside of the mdlInitializeSizes function. I have included simstruc.h at the start of the function and everything else was done properly to my knowledge, since the function compiled perfectly fine previously, before I tried to set any options. The code for mdlInitializeSizes is shown below:
static void mdlInitializeSizes(SimStruct *S)
/* Number of expected parameters--normally 0 */
ssSetNumSFcnParams(S, 0);
/* Return if number of expected != number of actual parameters */
if (ssGetNumSFcnParams(S) != ssGetSFcnParamsCount(S))
ssSetNumContStates( S, ntot); /* number of continuous states */
ssSetNumDiscStates( S, 1); /* number of discrete states */
ssSetNumInputs( S, ninpt); /* number of inputs */
ssSetNumOutputs( S, nout); /* number of outputs */
ssSetDirectFeedThrough(S, 1); /* direct feedthrough flag */
ssSetNumSampleTimes( S, 1); /* number of sample times */
ssSetNumRWork( S, 0); /* number of real work vector elements */
ssSetNumIWork( S, 0); /* number of integer work vector elements */
ssSetNumPWork( S, 0); /* number of pointer work vector elements */
ssSetNumModes( S, 0); /* number of mode work vector elements */
ssSetNumNonsampledZCs( S, 0); /* number of nonsampled zero crossings */
ssSetOptions(S,SS_OPTION_CALL_TERMINATE_ON_EXIT); /* general options (SS_OPTION_xx) */
The entire code is very long (~3000 lines) and includes other library files to compile, so I don't think I can include it, besides the rest of the code compiled fine in the past. I used to set:
and the code compiled without any problems, but now I need to use some of the options to try and troubleshoot a different problem with the code. I would really appreciate some help, I am not sure why this isn't working, I thought the option names were recognised by the compiler.

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