title: Heroku: Push rejected, failed to compile Ruby app
body: <p>I have been stuck for a week trying to figure this out. I have currently been following online lectures, however I followed everything exactly, and the instructor isn't really of any help. Whenever I try to push to heroku I receive the following:</p>
  
  <blockquote>
    <p>Initializing repository, done.
        Counting objects: 85, done.
        Delta compression using up to 2 threads.
        Compressing objects: 100% (76/76), done.
        Writing objects: 100% (85/85), 27.36 KiB, done.
        Total 85 (delta 6), reused 0 (delta 0)</p>
  
  <pre><code>-----&gt; Ruby app detected
  -----&gt; Compiling Ruby/Rails
  -----&gt; Using Ruby version: ruby-2.0.0
  -----&gt; Warning:
         Removing `Gemfile.lock` because it was generated on Windows.
         Bundler will do a full resolve so native gems are handled properly.
         This may result in unexpected gem versions being used in your app.
         In rare occasions Bundler may not be able to resolve your dependencies
   all.
         https://devcenter.heroku.com/articles/bundler-windows-gemfile
  -----&gt; Installing dependencies using Bundler version 1.5.2
         New app detected loading default bundler cache
         Running: bundle install --without development:test --path vendor/bundl
  -binstubs vendor/bundle/bin -j4
         Your Gemfile lists the gem sqlite3 (&gt;= 0) more than once.
         You should probably keep only one of them.
         While it's not a problem now, it could cause errors if you change the
  sion of just one of them later.
         Your Gemfile lists the gem sqlite3 (&gt;= 0) more than once.
         You should probably keep only one of them.
         While it's not a problem now, it could cause errors if you change the
  sion of just one of them later.
         Your Gemfile lists the gem rspec-rails (= 2.6.1) more than once.
         You should probably keep only one of them.
         While it's not a problem now, it could cause errors if you change the
  sion of just one of them later.
         Fetching gem metadata from https://rubygems.org/.........
         Fetching additional metadata from https://rubygems.org/..
         Resolving dependencies...
         Using builder (3.0.4)
         Using erubis (2.7.0)
         Using journey (1.0.4)
         Using rack (1.4.5)
         Using hike (1.2.3)
         Using tilt (1.4.1)
         Installing i18n (0.6.1)
         Using polyglot (0.3.3)
         Installing mime-types (1.25.1)
         Using tzinfo (0.3.38)
         Using bundler (1.5.2)
         Using coffee-script-source (1.6.3)
         Using execjs (2.0.2)
         Using json (1.8.1)
         Using thor (0.18.1)
         Installing multi_json (1.8.4)
         Installing rake (10.1.1)
         Installing arel (3.0.3)
         Using rack-cache (1.2)
         Using rack-test (0.6.2)
         Using rack-ssl (1.3.3)
         Using treetop (1.4.15)
         Using coffee-script (2.2.0)
         Using rdoc (3.12.2)
         Installing sass (3.2.13)
         Installing uglifier (2.4.0)
         Using sprockets (2.2.2)
         Using mail (2.5.4)
         Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native
  tension.
         /tmp/build_903734dc-f591-44eb-8891-428ba3caf9e0/vendor/ruby-2.0.0/bin/
  y extconf.rb
         checking for sqlite3.h... no
         sqlite3.h is missing. Try 'port install sqlite3 +universal'
         or 'yum install sqlite-devel' and check your shared library search pat
  the
         location where your sqlite3 shared library is located).
         *** extconf.rb failed ***
         Could not create Makefile due to some reason, probably lack of necessa
         libraries and/or headers.  Check the mkmf.log file for more details.
   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=/tmp/build_903734dc-f591-44eb-8891-428ba3caf9e0/vendor/ruby-2.0
  bin/ruby
         --with-sqlite3-dir
         --without-sqlite3-dir
         --with-sqlite3-include
         --without-sqlite3-include=${sqlite3-dir}/include
         --with-sqlite3-lib
         --without-sqlite3-lib=${sqlite3-dir}/
         --enable-local
         --disable-local
         Gem files will remain installed in /tmp/build_903734dc-f591-44eb-8891-
  ba3caf9e0/vendor/bundle/ruby/2.0.0/gems/sqlite3-1.3.8 for inspection.
         Results logged to /tmp/build_903734dc-f591-44eb-8891-428ba3caf9e0/vend
  bundle/ruby/2.0.0/gems/sqlite3-1.3.8/ext/sqlite3/gem_make.out
         Installing activesupport (3.2.13)
         Installing pg (0.17.1)
         An error occurred while installing sqlite3 (1.3.8), and Bundler cannot
  ntinue.
         Make sure that `gem install sqlite3 -v '1.3.8'` succeeds before bundli
  
         Bundler Output: Your Gemfile lists the gem sqlite3 (&gt;= 0) more than on
  
         You should probably keep only one of them.
         While it's not a problem now, it could cause errors if you change the
  sion of just one of them later.
         Your Gemfile lists the gem sqlite3 (&gt;= 0) more than once.
         You should probably keep only one of them.
         While it's not a problem now, it could cause errors if you change the
  sion of just one of them later.
         Your Gemfile lists the gem rspec-rails (= 2.6.1) more than once.
         You should probably keep only one of them.
         While it's not a problem now, it could cause errors if you change the
  sion of just one of them later.
         Fetching gem metadata from https://rubygems.org/.........
         Fetching additional metadata from https://rubygems.org/..
         Resolving dependencies...
         Using builder (3.0.4)
         Using erubis (2.7.0)
         Using journey (1.0.4)
         Using rack (1.4.5)
         Using hike (1.2.3)
         Using tilt (1.4.1)
         Installing i18n (0.6.1)
         Using polyglot (0.3.3)
         Installing mime-types (1.25.1)
         Using tzinfo (0.3.38)
         Using bundler (1.5.2)
         Using coffee-script-source (1.6.3)
         Using execjs (2.0.2)
         Using json (1.8.1)
         Using thor (0.18.1)
         Installing multi_json (1.8.4)
         Installing rake (10.1.1)
         Installing arel (3.0.3)
         Using rack-cache (1.2)
         Using rack-test (0.6.2)
         Using rack-ssl (1.3.3)
         Using treetop (1.4.15)
         Using coffee-script (2.2.0)
         Using rdoc (3.12.2)
         Installing sass (3.2.13)
         Installing uglifier (2.4.0)
         Using sprockets (2.2.2)
         Using mail (2.5.4)
  
         Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native
  tension.
  
         /tmp/build_903734dc-f591-44eb-8891-428ba3caf9e0/vendor/ruby-2.0.0/bin/
  y extconf.rb
         checking for sqlite3.h... no
         sqlite3.h is missing. Try 'port install sqlite3 +universal'
         or 'yum install sqlite-devel' and check your shared library search pat
  the
         location where your sqlite3 shared library is located).
         *** extconf.rb failed ***
         Could not create Makefile due to some reason, probably lack of necessa
         libraries and/or headers.  Check the mkmf.log file for more details.
   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=/tmp/build_903734dc-f591-44eb-8891-428ba3caf9e0/vendor/ruby-2.0
  bin/ruby
         --with-sqlite3-dir
         --without-sqlite3-dir
         --with-sqlite3-include
         --without-sqlite3-include=${sqlite3-dir}/include
         --with-sqlite3-lib
         --without-sqlite3-lib=${sqlite3-dir}/
         --enable-local
         --disable-local
  
  
         Gem files will remain installed in /tmp/build_903734dc-f591-44eb-8891-
  ba3caf9e0/vendor/bundle/ruby/2.0.0/gems/sqlite3-1.3.8 for inspection.
         Results logged to /tmp/build_903734dc-f591-44eb-8891-428ba3caf9e0/vend
  bundle/ruby/2.0.0/gems/sqlite3-1.3.8/ext/sqlite3/gem_make.out
         Installing activesupport (3.2.13)
         Installing pg (0.17.1)
         An error occurred while installing sqlite3 (1.3.8), and Bundler cannot
  ntinue.
         Make sure that `gem install sqlite3 -v '1.3.8'` succeeds before bundli
  
   !
   !     Failed to install gems via Bundler.
   !
   !     Detected sqlite3 gem which is not supported on Heroku.
   !     https://devcenter.heroku.com/articles/sqlite3
   !
  
   !     Push rejected, failed to compile Ruby app
  
  To git@heroku.com:tranquil-ridge-7489.git
   ! [remote rejected] master -&gt; master (pre-receive hook declined)
  error: failed to push some refs to 'git@heroku.com:tranquil-ridge-7489.git'
  </code></pre>
  </blockquote>
  
  <p>I have tried rebuilding the gem files, deleting gemfile.lock and running bundle installer, following solution from previous questions, but I am still getting this error.</p>
  
  <p>Here is my current gemFile:</p>
  
  <pre><code>source 'https://rubygems.org'
  
  gem 'rails', '3.2.13'
  
  # Bundle edge Rails instead:
  # gem 'rails', :git =&gt; 'git://github.com/rails/rails.git'
  
  gem 'sqlite3'
  
  
  # Gems used only for assets and not required
  # in production environments by default.
  group :assets do
    gem 'sass-rails',   '~&gt; 3.2.3'
    gem 'coffee-rails', '~&gt; 3.2.1'
  
    # See https://github.com/sstephenson/execjs#readme for more supported runtimes
    # gem 'therubyracer', :platforms =&gt; :ruby
  
    gem 'uglifier', '&gt;= 1.0.3'
  end
  
  gem 'jquery-rails'
  
  # To use ActiveModel has_secure_password
  # gem 'bcrypt-ruby', '~&gt; 3.0.0'
  
  # To use Jbuilder templates for JSON
  # gem 'jbuilder'
  
  # Use unicorn as the app server
  # gem 'unicorn'
  
  # Deploy with Capistrano
  # gem 'capistrano'
  
  # To use debugger
  # gem 'debugger'
  
  group :development do
      gem 'sqlite3'
      gem 'rspec-rails', '2.6.1', :require =&gt; 'rspec-rails'
      gem 'faker', '0.3.1'
  end
  
  group :test do
      gem 'sqlite3'
      gem 'rspec-rails', '2.6.1', :require =&gt; 'rpec-rails'
      gem 'webrat', '0.7.1'
      gem 'factory_girl_rails', '1.0'
      gem 'turn', :require =&gt; false
  end
  
  group :production do
      gem 'pg'
  end
  </code></pre>
  
  <p>Any help on this? </p>