```ruby
include_recipe 'yum'

case node['platform_version'].to_f
  when 6.4, 6.5
    remote_file '/tmp/epel.rpm' do
      source 'http://ftp.riken.jp/Linux/fedora/epel/6/i386/epel-release-6-8.noarch.rpm'
      action :create_if_missing
    end

    package 'epel' do
      source '/tmp/epel.rpm'
      provider Chef::Provider::Package::Rpm
      action :install
    end
  else
    raise %W(Platform not supported: #{node['platform_family']} (#{node[:platform]}) #{node['platform_version']}).join(' ')
end

yum_repository 'hhvm' do
  baseurl 'http://www.hop5.in/yum/el6/'
  gpgkey 'file:///etc/pki/rpm-gpg/RPM-GPG-KEY-HOP5'
  action :create
  notifies :run, 'bash[yum-clean-all]', :immediately
end

bash 'yum-clean-all' do
  command 'yum clean all'
  action :nothing
end

package 'hhvm' do
  options '-y --nogpgcheck'
end

if node['hhvm']['enable_fastcgi']
  log 'hhvm-fastcgi not supported' do
    message %W(hhvm-fastcgi is not supported on #{node['platform_family']} (#{node[:platform]}) #{node['platform_version']}).join(' ')
    level :warn
  end
end
```

Add support for Centos 6.6 and 6.7
user
```ruby
include_recipe 'yum'

case node['platform_version'].to_f
  when 6.4, 6.5, 6.6, 6.7 
    remote_file '/tmp/epel.rpm' do
      source 'http://ftp.riken.jp/Linux/fedora/epel/6/i386/epel-release-6-8.noarch.rpm'
      action :create_if_missing
    end

    package 'epel' do
      source '/tmp/epel.rpm'
      provider Chef::Provider::Package::Rpm
      action :install
    end
  else
    raise %W(Platform not supported: #{node['platform_family']} (#{node[:platform]}) #{node['platform_version']}).join(' ')
end

yum_repository 'hhvm' do
  baseurl 'http://www.hop5.in/yum/el6/'
  gpgkey 'file:///etc/pki/rpm-gpg/RPM-GPG-KEY-HOP5'
  action :create
  notifies :run, 'bash[yum-clean-all]', :immediately
end

bash 'yum-clean-all' do
  command 'yum clean all'
  action :nothing
end

package 'hhvm' do
  options '-y --nogpgcheck'
end

if node['hhvm']['enable_fastcgi']
  log 'hhvm-fastcgi not supported' do
    message %W(hhvm-fastcgi is not supported on #{node['platform_family']} (#{node[:platform]}) #{node['platform_version']}).join(' ')
    level :warn
  end
end
```
assistant