title: issue with install newest version of ruby on cetos
body: <p>Please help!!! 
  I have issue with installing new version of ruby in my Centos6. 
  I'l try install it using rvm :</p>
  
  <pre><code>/usr/local/rvm/bin/rvm install 1.9.2
  </code></pre>
  
  <p>And got the next message :</p>
  
  <blockquote>
    <p>Error running 'requirements_centos_libs_install libyaml-devel
    readline-devel libffi-devel sqlite-devel', showing last 15 lines of
    /usr/local/rvm/log/1439995406_ruby-1.9.2-p330/package_install_libyaml-devel_readline-devel_libffi-devel_sqlite-devel.log
    If you don't want/need both architectures anymore then you
           can remove the one with the missing update and everything
               will work.</p>
    
    <p>You have duplicate versions of libffi installed already.
      You can use "yum check" to get yum show these errors.</p>
    
    <p>...you can also use --setopt=protected_multilib=false to remove
      this checking, however this is almost never the correct thing to
      do as something else is very likely to go wrong (often causing
      much more problems).</p>
    
    <p>Protected multilib versions: libffi-3.0.5-3.2.el6.i686 != libffi-3.0.9-1.el5.rf.x86_64
    ++ return 1
    ++ return 1 Requirements installation failed with status: 1.</p>
  </blockquote>
  
  <p>I try to remove this lib but again fail :</p>
  
  <blockquote>
    <p>Error: Trying to remove "yum", which is protected</p>
  </blockquote>
  
  <p>Can somebody explain where I fail? Please! Thx all!</p>
  
  <p>p.s. I'm update the system (in case if answer will be "yum update") :)</p>