S-function builder didn't work

Hi, I'm try to create a S-function for my simulation. But when I used s-function builder and click build nothing happened. When I checked in the folder, matlab did create .c file and some other file for me but the model didn't update. I tried to update model but matlab said that function didn't exist. Can someone please help me? I use matlab R13. Thank you in advance.

[Walter Roberson]

Most people have forgotten the details of working with MATLAB 6.5 by now, as it has been 14 years since it was released.