/sys$common/syshlp/helplib.hlb CC, Messages, DEFINOTHER2  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        This declaration of "<name>" specifies a different
                type than the declaration in another module of this
                compilation at <where>.

 Description    In a compilation where interfile optimization has
                been selected (-ifo on UNIX, /PLUS_LIST_OPTIMIZE on
                OpenVMS), the compiler has detected a name with
                external linkage declared with different types in two
                different modules.  Although the runtime behavior may
                be as intended and match the behavior when the
                modules are separately compiled without interfile
                optimization, the behavior is not well defined unless
                the types are compatible.

 User Action    Modify one or more of the declarations to make the
                types compatible.