how do I apt-get specific versions

[Carl Karsten]

How do I install gcc v4.0?
this said it did:
sudo apt-get install gcc-4.0
gcc-4.0 is already the newest version.
but trying to run it:
-bash: gcc: command not found

This is on a edgy box that is having trouble building some boost libs, but I 
want to try it with the same versions of everything that build successfully.

here is what I am trying to match:

[root at mail ~]# rpm -q ImageMagick
ImageMagick-6.2.2.0-3.fc4.2
[root at mail ~]# rpm -q gcc
gcc-4.0.2-8.fc4
[root at mail ~]# rpm -q boost
boost-1.32.0-6
[root at mail ~]# rpm -q python
python-2.4.3-8.FC4
[root at mail ~]#

Carl K