How to let autoconf to check for bison specifically?

Gvnaena Pura <[email protected]>
Newsgroups gmane.comp.gnu.utils
Organization http://groups.google.com
Message-ID <[email protected]> 
Greetings,

When I use AC_PROG_YACC, autoconf will check for bison or byacc or
yacc.  But my program uses some features provided only by bison, so
how can I check for only bison?  Thanks.
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