title: Why isn't bundle install allowing for the pg gem to fully install?
body: <p>I've installed the pg gem as shown, but...</p>
  
  <pre><code>Building native extensions.  This could take a while...
      Successfully installed pg-0.11.0
      ERROR:  Could not find a valid gem '—' (&gt;= 0) in any repository
      ERROR:  Could not find a valid gem '–with-pg-config=/usr/local/pg/bin/pg_config' (&gt;= 0) in any repository
      1 gem installed
      Installing ri documentation for pg-0.11.0...
      Installing RDoc documentation for pg-0.11.0...
  </code></pre>
  
  <p>Something strange happens when I bundle install and it won't completely install the pg gem:</p>
  
  <pre><code>Fetching source index for http://rubygems.org/
  Using rake (0.9.2) 
  Using abstract (1.0.0) 
  Using activesupport (3.0.10) 
  Using builder (2.1.2) 
  Using i18n (0.5.0) 
  Using activemodel (3.0.10) 
  Using erubis (2.6.6) 
  Using rack (1.2.3) 
  Using rack-mount (0.6.14) 
  Using rack-test (0.5.7) 
  Using tzinfo (0.3.29) 
  Using actionpack (3.0.10) 
  Using mime-types (1.16) 
  Using polyglot (0.3.2) 
  Using treetop (1.4.10) 
  Using mail (2.2.19) 
  Using actionmailer (3.0.10) 
  Using arel (2.0.10) 
  Using activerecord (3.0.10) 
  Using activeresource (3.0.10) 
  Using annotate (2.4.0) 
  Using bundler (1.0.18) 
  Using diff-lcs (1.1.2) 
  Using factory_girl (1.3.3) 
  Using rdoc (3.9.3) 
  Using thor (0.14.6) 
  Using railties (3.0.10) 
  Using rails (3.0.10) 
  Using factory_girl_rails (1.0) 
  Using faker (0.3.1) 
  Using gravatar_image_tag (1.0.0.pre2) 
  Using nokogiri (1.5.0) 
  Installing pg (0.11.0) with native extensions /Users/******/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:552:in `rescue in block in build_extensions': ERROR: Failed to build gem native extension. (Gem::Installer::ExtensionBuildError)
  </code></pre>
  
  <p>Then I get the lines that tell me I may lack necessary libraries or headers:</p>
  
  <pre><code>   *** extconf.rb failed ***
      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.
  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=/Users/TonyNg/.rvm/rubies/ruby-1.9.2-p180/bin/ruby
      --with-pg
      --without-pg
      --with-pg-dir
      --without-pg-dir
      --with-pg-include
      --without-pg-include=${pg-dir}/include
      --with-pg-lib
      --without-pg-lib=${pg-dir}/lib
      --with-pg-config
  extconf.rb:24:in ``': No such file or directory - /users/****/
  </code></pre>
  
  <p>Here is my gem file:</p>
  
  <pre><code>  source 'http://rubygems.org'
  
  gem 'rails', '3.0.10'
  
  # Bundle edge Rails instead:
  # gem 'rails', :git =&gt; 'git://github.com/rails/rails.git'
  
  gem 'pg'
  gem 'gravatar_image_tag', '1.0.0.pre2'
  gem 'will_paginate', '3.0.pre2'
  
  
  
  group :development do
    gem 'rspec-rails', '2.6.1'
    gem 'annotate', '2.4.0'
    gem 'faker', '0.3.1'
  end
  
  group :test do
    gem 'rspec-rails', '2.6.1'
    gem 'webrat', '0.7.1'
    gem 'spork', '0.9.0.rc8'
    gem 'factory_girl_rails', '1.0'
  end
  
  # Use unicorn as the web server
  # gem 'unicorn'
  
  # Deploy with Capistrano
  # gem 'capistrano'
  
  # To use debugger (ruby-debug for Ruby 1.8.7+, ruby-debug19 for Ruby 1.9.2+)
  # gem 'ruby-debug'
  # gem 'ruby-debug19', :require =&gt; 'ruby-debug'
  
  # Bundle the extra gems:
  # gem 'bj'
  # gem 'nokogiri'
  # gem 'sqlite3-ruby', :require =&gt; 'sqlite3'
  # gem 'aws-s3', :require =&gt; 'aws/s3'
  
  # Bundle gems for the local environment. Make sure to
  # put test-only gems in this group so their generators
  # and rake tasks are available in development mode:
  # group :development, :test do
  #   gem 'webrat'
  # end
  </code></pre>
  
  <p>How do I solve this issue? Thanks in advance.</p>
  
  <p><strong>EDIT</strong>
  Answer:The trick was to install the pg gem under the <strong>correct</strong> pathway to pg_config whereas before it wasn't fully installed. I ran 'gem install pg -- --with-pg-config=/opt/local/lib/postgresql84/bin/pg_config ' for the path I had put down under my last comment.  I just had to locate my pg_config file and run gem install under that.</p>