How to install gcc-3.3 in Ubuntu 9.04

Today I tried to install gcc-3.3 in Ubuntu9.04 in my PC. I followed following steps. I found 2 patches to solve the errors in the Internet.
(NOTE: - means delete, and + means add as in Patch file)

1. Download gcc-core3.3.tar.bz2 and gcc-g++-3.3.tar.bz2
2. bzip2 -cd gcc-core3.3.tar.bz2 | tar xvf -
bzip2 -cd gcc-g++-3.3.tar.bz2 | tar xvf -
3. mkdir build
4. cd build
5. /home/xxxx/gcc/gcc-3.3/configure --prefix=/opt/gcc33 --program-suffix=33 --enable-languages=c,c++

6. If there are errors from /usr/include/bits/studio-lock.h file
then comment the /*#include */
- #include
+ /*#include */
7. If there are errors from gcc/gcc-3.3/include/obstack.h file ("/read-rtl.c:653: error: lvalue required as increment operand")
Change line#423 in gcc/gcc-3.3/include/obstack.h
- *((void **)__o->next_free)++ = ((void *)datum); \
+ *((void **)__o->next_free) = ((void *)datum);
+ __o->next_free += sizeof(void *); \
8. If there are errors from decl.c file
Apply gcc42-patch-gcc-3.3.1_gcc_cp_decl.c patch from ftp.nsysu.edu.tw/FreeBSD/FreeBSD-current/ports/palm/prc-tools/files/gcc42-patch-gcc-3.3.1_gcc_cp_decl.c
9. If there is an error "gcc/collect2.c:1779:/usr/include/bits/fcntl2.h:51: error: call to ‘__open_missing_mode’ declared"
Then, in the line number 1776 of gcc/collect2.c
- redir_handle = open (redir, O_WRONLY | O_TRUNC | O_CREAT);
+ redir_handle = open (redir, O_WRONLY | O_TRUNC | O_CREAT, 0666);
10. make
11. Follow http://www.mjmwired.net/resources/mjm-fedora-gcc.html

Few useful commands:
sudo apt-get install gcc
find /usr/bin |grep gcc
find /usr/bin |grep g++
stat /usr/bin/gcc

$ cd /usr/bin
The default gcc version
$ gcc --v

Delete the old symbolic links
$ sudo rm cpp gcc g++

Change the symbolic links to 3.3: (Find where the gcc33 is installed. In this example we installed in /opt/gcc33/bin (we gave the command while installing gcc as: --prefix=/opt/gcc33).

$sudo ln -s /opt/gcc33/bin/g++33 /usr/bin/g++
$sudo ln -s /opt/gcc33/bin/gcc33 /usr/bin/gcc
$sudo ln -s /opt/gcc33/bin/cpp33 /usr/bin/cpp

Check the default gcc version

$ gcc --v

It should show new gcc version.