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

 Message        The message id <name> cannot be disabled.

 Description    The compiler's error and fatal messages cannot be
                disabled.

 User Action    Remove this message id from the list of messages
                being disabled on the command line or in the #pragma
                message line.