Phil's changes exposed the fact that the lib64z1-dev package is not available to the Ubuntu AMI based EC2 images, it's simply not in their package repository.  The changes caused this to break the install, but previously the failed install was simply skipped ( and none of the Ubuntu based EC2 images have this available ).  Sine the other ships are running fine without this package being installed, and it now causes the install to fail, I'm removing it