It would take me some time to test the internationalization support kit...
Currently, RUNOFF gives nine messages as
%RUNOFF-W-IIF, ^^<CHAR> ignored
which are also included in the help library (the .HLB, not the .GIH).
With MMK/IGNORE (but not with MMK/IGNORE=WARNINGS), the help library is created; in the COM procedure I added an ON SEVERE_ERROR line.
While using the HLB is preferred under VMS, creating the GIH just takes a little time so I added it to CONFIGURE.VMS, but put back the NO_GIH define.