# apt-cache policy libc6
libc6:
  Installed: 2.3.6.ds1-13etch5
  Candidate: 2.3.6.ds1-13etch5
  Version table:
     2.7-10 0
         -1 http://ftp.debian.org testing/main Packages
 *** 2.3.6.ds1-13etch5 0
        100 /var/lib/dpkg/status