A few build bot machines fail at "test install" stage due to unixODBC missing dependency

A few build bot machines fail at the "test install" stage
with similar symptoms:

http://buildbot.askmonty.org/buildbot/builders/kvm-rpm-centos5-amd64/builds/2088/steps/test/logs/stdio
http://buildbot.askmonty.org/buildbot/builders/kvm-rpm-centos5-x86/builds/2359/steps/test/logs/stdio
http://buildbot.askmonty.org/buildbot/builders/kvm-rpm-centos6-amd64/builds/849/steps/test/logs/stdio
http://buildbot.askmonty.org/buildbot/builders/kvm-rpm-centos6-x86/builds/671/steps/test/logs/stdio
http://buildbot.askmonty.org/buildbot/builders/kvm-rpm-fedora17-amd64/builds/881/steps/test/logs/stdio
http://buildbot.askmonty.org/buildbot/builders/kvm-rpm-fedora17-x86/builds/473/steps/test/logs/stdio
http://buildbot.askmonty.org/buildbot/builders/kvm-rpm-fedora18-amd64/builds/222/steps/test/logs/stdio
http://buildbot.askmonty.org/buildbot/builders/kvm-rpm-fedora18-x86/builds/239/steps/test/logs/stdio
http://buildbot.askmonty.org/buildbot/builders/kvm-rpm-rhel5-amd64/builds/1289/steps/test/logs/stdio

The packaging tools on these machines do see unixODBC dependency,
but they are not able to install it for some reasons.