gcc4: What deb-src line to put in sources.list?

[Michal Schmidt <xschmi00@stud.feec.vutbr.cz>]

Hello,

I have this line in my /etc/apt/sources.list:
  deb-src http://debian-ppc64.alioth.debian.org/gcc4 unstable main
but it doesn't work. Source packages seem to be missing on this server. 
Where can I get the source packages for the gcc4 repository?

Regards
Michal