simulink builder getting dll

Good afternoon!

I have a simulink model and I want to generate a dll file from it. In the model I have different S-Function that I compile using mex. But when I start generating a dll file the linker gives me a error. I think that the linker doesn´t find the .obj file, but the file it want to find is the .obj file of a cpp file that i used before creating mex.

I think the linker is searching for a file that i use in a SFunction.

If I don´t explain well, say and I will try again.

Thanks