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

 Message        Illegal characters after header name.

 Description    While processing an #include directive whose argument
                did not start with either a '<' or '"' character, the
                compiler encountered a character it did not expect.
                This most often occurs when the directive argument is
                a macro and there is an error during the expansion of
                that macro.

 User Action    Correct the argument to the #include directive.