VMS Help CC, Messages, SAMEASTYPEDEF  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        <Context> the extern has the same name as a
                file-scope typedef.  This is a language extension.

 Description    The program has declared an extern inside a function
                whose name matches a file-scope typedef.  This is not
                allowed by the C standard, but is accepted for
                compatibility with other C compilers.

 User Action    Change the name of the variable or the typedef.