From: sorinb AT sky DOT dsp DOT pub DOT ro (Balea Mihai Sorin)
Subject: Re: Question about GNU
To: F655167 AT cicei DOT ulpgc DOT es (Pedro J. Santana Aleman)
Date: Tue, 14 Nov 1995 12:45:35 +0200 (EET)
Cc: djgpp AT sun DOT soe DOT clarkson DOT edu

On Mon, Nov 14, Pedro J. Santana wrote:
> 
> What are Bison and flex?. What is it they do?

They are a couple of extremely usefull programs if you are working in 
language related areas ( compilers, interpreters, and so on ).Flex takes
a lexical description file and generates C source for a lexical analyser
( a.k.a. scanner ).Bison takes a syntactical description file and generates
C source for a syntax analyser ( a.k.a. parser ) .With these two , you can
create a program that makes decisions on the basis of some text input and
some lexical and syntactical rules.
Well, I suppose this isn't much of an explanation, if you want more details
read the docs. They explain things much better than me. 
 
> Is very necessary install GRX library or not?

No, it isn't. But if you want high quality graphics you'd better consider
installing it.
 
> Thanks :-)
> 

Hope this helps,

Sorin Balea -- sorinb AT sky DOT dsp DOT pub DOT ro