MISSINGFUNC

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.