Message        The function "<name>" has internal linkage, occurs in
                a context that requires its definition, and has no
                definition.

 Description    The program has referenced a function declared with
                static storage class, but the function is not defined
                in the compilation unit.  If a program references a
                static function, the function must be defined in the
                compilation unit.

 User Action    Either define the function or change the function
                declaration to have extern storage class.