Info Catalog flex: unnamed-faq-101 flex: FAQ flex: Why do I get "conflicting types for yylex" error?

flex: What is the difference between YYLEX_PARAM and YY_DECL?

 
 What is the difference between YYLEX_PARAM and YY_DECL?
 =======================================================
 
 YYLEX_PARAM is not a flex symbol.  It is for Bison.  It tells Bison to
 pass extra params when it calls yylex() from the parser.
 
    YY_DECL is the Flex declaration of yylex.  The default is similar to
 this:
 
      #define int yy_lex ()
 

Info Catalog flex: unnamed-faq-101 flex: FAQ flex: Why do I get "conflicting types for yylex" error?