How to instantiate a class from a library on an S-Function

Hello,

I am trying to instantiate a class from a library: mcp_can.h. The following is the code that I have placed in the "libraries" field of the S-Function builder:

1. ifndef MATLAB_MEX_FILE
2. include arduino.h # include "SPI.h" # include "mcp_can.h" # include "mcp_can_dfs.h" # include "Wire.h" # include "twi.h" # define CANint 2

    MCP_CAN CAN0(10);

    void setup()
    {
    pinMode(CANint, INPUT);
    }

#endif

After that, the portion of the code that I have placed in the "outputs" portion executes. That code is below:

if (xD[0]==1) {

    /* don't do anything for mex file generation */
    # ifndef MATLAB_MEX_FILE
    unsigned char stmp[8] = {50, 1, 2, 3, 4, 5, 6, 7};
    CAN0.sendMsgBuf(0x200, 0, 8, stmp);
    delay(.2*1000); 

    #endif

}

When I attempt to build this function and run it on my arduino board, I get the following errors:

C:\EcoCAR2_SVN\Controls\The Domain\The Index\Utilities\Arduino CAN Shield Simulink Support\CAN_S_Functions_rtt/CAN_Transmit_wrapper.cpp:47: undefined reference to `MCP_CAN::MCP_CAN(unsigned char)' ./CAN_Transmit_wrapper.o: In function `CAN_Transmit_Outputs_wrapper': C:\EcoCAR2_SVN\Controls\The Domain\The Index\Utilities\Arduino CAN Shield Simulink Support\CAN_S_Functions_rtt/CAN_Transmit_wrapper.cpp:86: undefined reference to `MCP_CAN::sendMsgBuf(unsigned long, unsigned char, unsigned char, unsigned char*)' make: * [MW/CAN_S_Functions.elf] Error 1

The first error is of the most concern to me and the second is a consequence of the first. Why would simulink have a problem with me instantiating the class like i do?

Any assistance would be appreciated.