C++ variants in reentrant bison/flex combination

[PICHLMEIER Florian]

Hello,

I am trying to modify an existing nonreentrant bison/flex combination to be 
reentrant.
The parser is built from the C++ skeleton lalr1.cc and the scanner with the 
plain C version of flex.
Here are the first lines of parser.yy

%skeleton "lalr1.cc" /* -*- C++ -*- */
%require "3.0"
%no-lines
%defines
%define parser_class_name {parser}

%define api.token.constructor
%define api.value.type variant
%define parse.assert

The problem I encounter during compilation is the error "YYSTYPE does not name 
type" .
I read through the manual of bison and flex, and tried to find an example 
online that combines an reentrant C++ parser C scanner combination
that also uses C++ variants but couldn't find one.
I am using bison 3.0.4 and flex 2.6.1. Can someone here help me with this 
problem?

Best regards,
Florian
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