Re: AC_PROG_YACC question

[Akim Demaille]

| > You'll need to call
| >   AC_CHECK_PROGS(YACC, byacc yacc 'bison -y', [AM_MISSING_PROG(yacc)])
| > instead of using the undocumented, unsupported, internal am_missing_run
| 
| That had worried me a little.  Thanks for clarifying that.

It seems incorrect to me.  AC_MISSING_PROG is a macro performing a
task (i.e., an instruction), while AC_CHECK_PROGS wants a value as $4
(i.e., an expression).

The point of missing is having the right thing happen even if the
program is missing, so don't bother looking for a Yacc, require Bison:

AM_MISSING_PROG([YACC], [bison -y])