[m-rev.] for review: user-defined events

[Zoltan Somogyi]

On 20-Nov-2006, Julien Fischer <juliensf at csse.unimelb.edu.au> wrote:
> Rather than just assuming the existence of bison and yacc the configure
> script should be modified to check, e.g. using the AC_PROG_LEX and
> AC_PROG_YACC macros.

The code there assumes flex and bison; it won't work with old lex and yacc
(lex doesn't have %option noyywrap, and yacc doesn't take an option to specify
the prefix).

Zoltan.
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