title: Installing libyaml for ruby on a mac osX (Lion)
body: <p>I am getting this error message:</p>
  
  <pre><code>"It seems your ruby installation is missing psych (for YAML output).
  To eliminate this warning, please install libyaml and reinstall your ruby."
  </code></pre>
  
  <p>I have tried entering this command: <code>rvm pkg install libyaml</code></p>
  
  <p>and I am getting this error message:</p>
  
  <pre><code>"Fetching yaml-0.1.4.tar.gz to /Users/luke/.rvm/archives
  Extracting yaml-0.1.4.tar.gz to /Users/luke/.rvm/src
  Error running 'tar xmzf /Users/luke/.rvm/archives/yaml-0.1.4.tar.gz -C
  /Users/luke/.rvm/src ', 
     please read /Users/luke/.rvm/log/yaml/extract.log
  Configuring yaml in /Users/luke/.rvm/src/yaml-0.1.4.
  Error running ' ./configure --prefix="/Users/luke/.rvm/usr"  ', 
     please read /Users/luke/.rvm/log/yaml/configure.log
  Compiling yaml in /Users/luke/.rvm/src/yaml-0.1.4.
  Error running 'make ', please read /Users/luke/.rvm/log/yaml/make.log
  
  Database file /Users/luke/.rvm/config/packages does not exist."
  </code></pre>
  
  <p>Does anyone know what I am doing wrong? Thanks!</p>