I have installed gcc-4.6 at /usr/bin. I am trying to install gcc-3.4 at /usr/local/bin. I downloaded gcc-3.4.6.tar.gz from gnu.org and "detarred" the file. I can configure the file without any error using --prefix =-/usr/local/3.4.6 . However, when I run make bootstrap-lean all I get is a stream of errors that indicate problems with the installed gcc-4.6 include files.
I don't know how to deal with this problem. Perhaps someone can suggest a solution.