This is has been fixed: yylval, yynerrs, yychar, and yylloc are now valid
identifiers for user-provided variables.
+*** stdio.h is no longer needed when locations are enabled (yacc.c)
+
+ Changes in Bison 2.7 introduced a dependency on FILE and fprintf when
+ locations are enabled. This is fixed.
+
** Diagnostics reported by Bison
Most of these features were contributed by Théophile Ranquet and Victor