gcc and his standard-directorys?

[Erik Wasser]

Hello.

I've have a basic question about the gcc (my version is 2.95). Where can I
determinate the directory where the gcc will look for the includes and the
directorys for librarylinking. I know about the flags -I and -L but there
are always some standarddirectorys. Where can I change the basic
directorys?

Background: I have different versions of gcc on my computer and I want to
to separete them cleanly. Every version should use his own directory for
"include"ing and "link"ing.

Thx for your time.

-- 
        Erik Wasser
        C-Lab Rechnerbetreuung
Phone : (05251) 606051