yacc-stderr-output

How can I make yacc not to print these "syntax error" stderr-output?
bodirskyAsked:
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ahoffmannCommented:
Define your own yyerror. Also look for the macros YYERROR, YYACCEPT, and the variables (defines) yyerrok, yyerrflag.
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bodirskyAuthor Commented:
You're earning quite much points with my attempt learning yacc...

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ahoffmannCommented:
Fiddled around long time with lex/yacc before I switched to flex/bison. There are too much question in traditional lex/yacc and just answers (man-pages) in flex/bison ;)
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