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

 Message        Missing #if conditional expression.

 Description    An argument was not supplied to an #if or #elif
                preprocessing directive.  The missing argument will
                cause the compiler to consider these as FALSE
                conditionals.

 User Action    Supply a valid argument to the directive.