title: Error installing ibm_db: ERROR: Failed to build gem native extension
body: <p>Ok, so I'm trying to install de ibm_db gem this time and this is the error i get:</p>
  
  <p>root@ubuntu:~# sudo gem install ibm_db
  Building native extensions.  This could take a while...
  ERROR:  Error installing ibm_db:
      ERROR: Failed to build gem native extension.</p>
  
  <pre><code>/usr/local/bin/ruby extconf.rb
  </code></pre>
  
  <p>Detected 32-bit Ruby</p>
  
  <p>Environment variable IBM_DB_HOME is not set. Set it to your DB2/IBM_Data_Server_Driver installation directory and retry gem install.</p>
  
  <p>Gem files will remain installed in /usr/local/lib/ruby/gems/2.0.0/gems/ibm_db-2.5.11 for inspection.
  Results logged to /usr/local/lib/ruby/gems/2.0.0/gems/ibm_db-2.5.11/ext/gem_make.out</p>
  
  <p>Im really lost, i dunno what to do!! Help… please? </p>