Description of problem:

After a clean F12 alpha install (without devel packages), I tried to
install gcc, but getting some repo issues:

Error Downloading Packages:
   ppl-0.10.2-5.fc12.i686: failure: Packages/ppl-0.10.2-5.fc12.i686.rpm 
from InstallMedia: (256, 'No more mirrors to try.')
   binutils-2.19.51.0.14-31.fc12.i686: failure: 
Packages/binutils-2.19.51.0.14-31.fc12.i686.rpm from InstallMedia: (256, 
'No more mirrors to try.')

binutils-2.19.51.0.14-31.fc12.i686: failure: 
Packages/binutils-2.19.51.0.14-31.fc12.i686.rpm from InstallMedia: (256, 
'No more mirrors to try.')

I could solve the problem: I found in /etc/yum.repos.d a file called
Fedora-install-media.repo with the following lines:()

[InstallMedia]
name=Fedora 12-Alpha
mediaid=1250548413.424676
metadata_expire=-1
gpgcheck=0
cost=500
()
It seems this file had been added by anaconda 


Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1.Install f12 alpha without gcc
2.Try to install gcc after f12 installation with yum
3.
  
Actual results:
yum fails

Expected results:
gcc is installed

Additional info:
see https://bugzilla.redhat.com/show_bug.cgi?id=520790