Knoppix 7.0.3 CD & DVD now on mirrors

[ruymbeke]

...So I need to either downgrade gcc to 4.7.1-1 or use a previous version of Knoppix...

Well Knoppix 7.0.2 is using an older version of gcc 4.6.3-7 so I will need to downgrade gcc on Knoppix 7.0.3.
So what is the easiest way to find and reinstall an older version of gcc ?
apt-get -y --reinstall install gcc-4.7=4.7.1 does not work: "E: Version '4.7.1' for 'gcc-4.7' was not found"
Best Regards,
Gilles