How to install gcc-4.0.1.tar.bz2_FILES??

have some files like these in document~~~
ABOUT-NLS configure.in libcpp Makefile.def
boehm-gc contrib libffi Makefile.in
BUGS COPYING libgfortran Makefile.tpl
bugs.html COPYING.LIB libiberty MD5SUMS
ChangeLog depcomp libjava missing
ChangeLog.tree-ssa FAQ libmudflap mkdep
compile faq.html libobjc mkinstalldirs
confdefs.h fastjar libstdc++-v3 move-if-change
config fixincludes libtool.m4 NEWS
config.cache gcc ltcf-c.sh README
config.guess include ltcf-cxx.sh README.SCO
config.log INSTALL ltcf-gcj.sh symlink-tree
config-ml.in install-sh ltconfig ylwrap
config.rpath intl ltmain.sh zlib
config.sub LAST_UPDATED MAINTAINERS
configure libada maintainer-scripts

Ubuntu has already had the gcc 4.0.1 package :)

It is in the Breezy (testing) version.

>>search result<<

After you added breezy sources in your /etc/apt/sources.list,
you can just use

sudo apt-get install gcc-4.0

to install it.

If you really want to build it from scratch,
here is the office GCC install guide

>>the GCC install guide<<

Trust me ! It will be a long long fighting, and you will be very proud of your new GCC :)