Reentrant parser

[Toto from_moon]

Hello,
I would like to use a reentrant parser under windows, by using bison and 
flex. I am currently using bison 1.875 and flex 2.5.4a.
Since reentrant options are not present in flex 2.5.4a, I was considering 
installing flex 2.5.31 but found no binary versions for windows on Internet.
So my questions are :
is it possible to compile the sources of 2.5.31 to make a binary for windows 
?
or where can I find flex executable for windows ?
or is it possible to easily rearrange code of bison 1.875 and flex 2.5.4a to 
make a reentrant parser ?

Thanks in advance,
Philippe