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

 Message        <Context> the __declspec(thread) storage class
                modifier of "<name>" is different from a previous
                declaration of "<name>" at <location>.

 Description    If an object is declared with thread-local storage,
                then all declarations of that object must declare it
                with thread-local storage.

 User Action    Either remove the invalid redeclaration or modify it
                to match the previous declaration.