Puppet users - Mar 2014 - Puppet fails to run if ruby1.8 is not installed.

Amazon this week took ruby1.8 out of their Amazon Linux distro.

Only ruby2.0 is installed.

After installing the puppetlabs yum repo package, and then yum install
puppet, I have this error:

# puppet agent -t
/usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in
`require': cannot load such file -- puppet/util/command_line (LoadError)
        from
/usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in
`require'
        from /usr/bin/puppet:3:in `<main>'

If I install ruby18, I can get things working again, but puppet's web page
says ruby 2.0 is perfectly supported.

I note that the puppetlabs puppet RPM installs a TON of stuff in
/usr/lib/ruby/site_ruby/1.8 but there's no corresponding 'stuff' for
2.0.
Specifically, the 'command_line' bit certainly is only in the 1.8
path...

Any insights would be deeply appreciated.

(and yes, I could install 1.8, set alternatives to use 1.8, etc, but I'd
rather not bother)

System details:

# rpm -qa | grep puppet
puppetlabs-release-6-10.noarch
puppet-3.4.3-1.el6.noarch

# rpm -qa | grep ruby
rubygems20-2.0.14-1.14.amzn1.noarch
ruby-shadow-1.4.1-15.5.amzn1.x86_64
libselinux-ruby-2.1.10-3.17.amzn1.x86_64
ruby20-libs-2.0.0.451-1.14.amzn1.x86_64
ruby-rgen-0.6.5-2.el6.noarch
rubygem20-psych-2.0.0-1.14.amzn1.x86_64
rubygem20-rdoc-4.0.1-2.18.amzn1.noarch
ruby-2.0-0.3.amzn1.noarch
rubygem20-bigdecimal-1.2.0-1.14.amzn1.x86_64
ruby-augeas-0.4.1-1.6.amzn1.x86_64
rubygem20-json-1.7.7-101.27.amzn1.x86_64
ruby20-irb-2.0.0.451-1.14.amzn1.noarch
ruby20-2.0.0.451-1.14.amzn1.x86_64
ruby18-libs-1.8.7.374-2.42.3.amzn1.x86_64
rubygem-json-2.0-0.3.amzn1.noarch

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