/sys$common/syshlp/helplib.hlb CC, Messages, IMPLICITFUNC  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        <Context> the identifier "<name>" is implicitly
                declared as a function.

 Description    A expression contained a reference to a function that
                has not been declared.

 User Action    Declare the function before it is referenced.