title: "rvm install ree" fails on ubuntu: how to get pass openssl and zlib dev headers requirement?
body: <p>I want to install Ruby Entreprise Edition via rvm on Ubuntu.
  I'm running the following:</p>
  
  <pre><code>$ rvm install ree --with-readline-dir=/home/ubuntu/.rvm/usr --with-iconv-dir=/home/ubuntu/.rvm/usr --with-zlib-dir=/home/ubuntu/.rvm/usr --with-openssl-dir=/home/ubuntu/.rvm/usr
  </code></pre>
  
  <p>However, it fails with the following error:</p>
  
  <pre><code>Installing Ruby Enterprise Edition from source to: /home/ubuntu/.rvm/rubies/ree-1.8.7-2011.03
  ree-1.8.7-2011.03 - #fetching (ruby-enterprise-1.8.7-2011.03)
  ree-1.8.7-2011.03 - #extracting ruby-enterprise-1.8.7-2011.03 to /home/ubuntu/.rvm/src/ree-1.8.7-2011.03
  ree-1.8.7-2011.03 - #installing 
  ERROR: Error running './installer -a /home/ubuntu/.rvm/rubies/ree-1.8.7-2011.03  --dont-install-useful-gems ', please read /home/ubuntu/.rvm/log/ree-1.8.7-2011.03/install.log
  ERROR: There has been an error while trying to run the ree installer. Halting the installation.
  </code></pre>
  
  <p>The file /home/ubuntu/.rvm/log/ree-1.8.7-2011.03/install.log says the following:</p>
  
  <pre><code> * C compiler... found at /usr/bin/gcc
   * C++ compiler... found at /usr/bin/g++
   * The 'make' tool... found at /usr/bin/make
   * The 'patch' tool... found at /usr/bin/patch
   * Zlib development headers... found
   * OpenSSL development headers... not found
   * GNU Readline development headers... not found
  
  Some required software is not installed.
  But don't worry, this installer will tell you how to install them.
  Press Enter to continue, or Ctrl-C to abort.
  --------------------------------------------
  Installation instructions for required software
  
   * To install OpenSSL development headers:
     Please download it from http://www.openssl.org/
  
   * To install GNU Readline development headers:
     Please download it from http://cnswww.cns.cwru.edu/php/chet/readline/rltop.html
  </code></pre>
  
  <p>However I do have openssl, readline, and zlib-devel installed both as rvm package and via apt-get on the system.</p>
  
  <pre><code>$ rvm package install ree_dependencies
  </code></pre>
  
  <p>Please help!</p>