this API is not documented/supported by NeXT and may go away at any time,
  so test again when you upgrade (works fine for me on NEXTSTEP_Dev_3.2)
-------------------------------------------------------------------------
See KBNS.32.2.029 from the successor of:
ftp://ftp.cs.orst.edu/software/NeXT/documents/KBNS.32.1.rtf
Otherwise (that successor not yet having been published), ask me for a copy
of the item on RfSchtkt@maze.ruca.ua.ac.be. Bison's messages are not as
disciplined as flex' ones, so it should get more discipline first.

Specifically (in addition to what's described in the KBNS item):
makeUser.o and make_support.o should be added to OBJECTS in Makefile.in
In parse.y, line_pinpoint() (assumption all messages ultimately go there), add:
	  make_support(
	    // don't worry about declaring: cc's source doesn't either,
	    // it seems
	    syntaxerror?0:1,
	    NULL,
	    infilename,
	    line,
	    str,
	    0,0,0
	    );

FMyIO: in cc, these files contain the word make_support:
  ChangeLog-NeXT
  Makefile.in
  config/next.h: defines REPORT_EVENT in terms of make_support
  make_support.c

FMyIO: in cc, these files contain the word REPORT_EVENT:
  cccp.c
  config/next.h
  gcc.c
  toplev.c