title: How to Install Postgresql Gem on Ubuntu
body: <p>I have Ubuntu 12.04 Precise installed via crouton on my Asus Chromebook. I have a rails application that requires postgres. When I run "bundle" it fails to install the pg gem. I try installing multiple versions of it independently and it fails. The failure report is below:</p>
  
  <blockquote>
    <blockquote>
      <p>Building native extensions.  This could take a while... ERROR:  Error installing pg:
              ERROR: Failed to build gem native extension.</p>
    </blockquote>
  
  <pre><code>/home/oscar/.rvm/rubies/ruby-1.9.3-p551/bin/ruby -r ./siteconf20150331-16650-11xjo0a.rb extconf.rb checking for
  </code></pre>
    
    <p>pg_config... yes Using config values from /usr/bin/pg_config You need
    to install postgresql-server-dev-X.Y for building a server-side
    extension or libpq-dev for building a client-side application. You
    need to install postgresql-server-dev-X.Y for building a server-side
    extension or libpq-dev for building a client-side application.
    checking for libpq-fe.h... no Can't find the 'libpq-fe.h header
    <strong>* extconf.rb failed *</strong> Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers.  Check
    the mkmf.log file for more details.  You may need configuration
    options.</p>
    
    <p>Provided configuration options:
            --with-opt-dir
            --without-opt-dir
            --with-opt-include
            --without-opt-include=${opt-dir}/include
            --with-opt-lib
            --without-opt-lib=${opt-dir}/lib
            --with-make-prog
            --without-make-prog
            --srcdir=.
            --curdir
            --ruby=/home/oscar/.rvm/rubies/ruby-1.9.3-p551/bin/ruby
            --with-pg
            --without-pg
            --enable-windows-cross
            --disable-windows-cross
            --with-pg-config
            --without-pg-config
            --with-pg_config
            --without-pg_config
            --with-pg-dir
            --without-pg-dir
            --with-pg-include
            --without-pg-include=${pg-dir}/include
            --with-pg-lib
            --without-pg-lib=${pg-dir}/lib</p>
    
    <p>extconf failed, exit code 1</p>
    
    <p>Gem files will remain installed in
    /home/oscar/.rvm/gems/ruby-1.9.3-p551/gems/pg-0.18.1 for inspection.
    Results logged to
    /home/oscar/.rvm/gems/ruby-1.9.3-p551/extensions/x86_64-linux/1.9.1/pg-0.18.1/gem_make.out</p>
  </blockquote>
  
  <p>I also tried to install it using brew. The files downloaded, and seem to install but when I run "brew upgrade postgresql" it says that postgresql doesn't exits. I am all out of ideas, and I haven't been able to find anyone else with my problem.</p>