Gem pg bundle install error

vagrant@ylosix-vm:/vagrant$ bundle install
Fetching gem metadata from https://rubygems.org/
Fetching version metadata from https://rubygems.org/
Fetching dependency metadata from https://rubygems.org/
Fetching git://github.com/ryanfox1985/annotate_models.git
Fetching git://github.com/ylosix/liquid.git
Installing rake 10.5.0
Installing i18n 0.7.0
Using json 1.8.3
Installing minitest 5.8.4
Installing thread_safe 0.3.5
Installing builder 3.2.2
Installing erubis 2.7.0
Installing mini_portile2 2.0.0
Installing rack 1.6.4
Installing mime-types 2.99.1
Installing sass 3.4.22
Installing thor 0.19.1
Installing coffee-script-source 1.10.0
Installing execjs 2.6.0
Installing formtastic_i18n 0.6.0
Installing arel 6.0.3
Using bundler 1.12.1
Installing concurrent-ruby 1.0.1
Installing tilt 2.0.2
Installing addressable 2.4.0
Installing ast 2.2.0
Installing ice_nine 0.11.2
Installing bcrypt 3.1.11 with native extensions
Installing bower-rails 0.10.0
Installing uniform_notifier 1.9.0
Installing byebug 8.2.4 with native extensions
Installing choice 0.2.0
Installing orm_adapter 0.5.0
Installing equalizer 0.0.11
Installing docile 1.1.5
Installing simplecov-html 0.10.0
Installing colorize 0.7.7
Installing tins 1.6.0
Installing daemons 1.2.3
Installing debug_inspector 0.0.2 with native extensions
Installing devise-i18n 1.0.1
Using did_you_mean 1.0.0
Installing unf_ext 0.0.7.2 with native extensions
Installing eventmachine 1.0.9.1 with native extensions
Installing fast_stack 0.2.0 with native extensions
Installing sexp_processor 4.7.0
Installing multi_json 1.11.2
Installing le 2.7.1
Using liquid 4.0.0.alpha from git://github.com/ylosix/liquid.git (at master@9a4df89)
Installing sqlite3 1.3.11 with native extensions
Installing netrc 0.11.0
Installing mimemagic 0.3.0
Installing newrelic_rpm 3.15.1.316
Installing request_store 1.3.1
Installing pg 0.18.4 with native extensions

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /home/vagrant/.rvm/gems/ruby-2.3.0@testing/gems/pg-0.18.4/ext
/home/vagrant/.rvm/rubies/ruby-2.3.0/bin/ruby -r ./siteconf20160502-18148-w48hrg.rb extconf.rb
checking for pg_config... no
No pg_config... trying anyway. If building fails, please try again with
 --with-pg-config=/path/to/pg_config
checking for libpq-fe.h... no
Can't find the 'libpq-fe.h header
*** 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=/home/vagrant/.rvm/rubies/ruby-2.3.0/bin/$(RUBY_BASE_NAME)
        --with-pg
        --without-pg
        --enable-windows-cross
        --disable-windows-cross
        --with-pg-config
        --without-pg-config
        --with-pg_config
        --without-pg_config
        --with-pg-dir
        --without-pg-dir
        --with-pg-include
        --without-pg-include=${pg-dir}/include
        --with-pg-lib
        --without-pg-lib=${pg-dir}/lib

To see why this extension failed to compile, please check the mkmf.log which can be found here:

  /home/vagrant/.rvm/gems/ruby-2.3.0@testing/extensions/x86_64-linux/2.3.0/pg-0.18.4/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /home/vagrant/.rvm/gems/ruby-2.3.0@testing/gems/pg-0.18.4 for inspection.
Results logged to /home/vagrant/.rvm/gems/ruby-2.3.0@testing/extensions/x86_64-linux/2.3.0/pg-0.18.4/gem_make.out
Installing powerpack 0.1.1
Installing puma 3.4.0 with native extensions
Installing ruby-graphviz 1.2.2
Installing rainbow 2.1.0
Installing ruby-progressbar 1.7.5
Installing unicode-display_width 1.0.3
Installing ruby-prof 0.15.9 with native extensions
Installing rubyzip 1.2.0
Installing slack-notifier 1.5.1
Installing spring 1.7.1
Installing stackprof 0.2.8 with native extensions
Installing yard 0.8.7.6
Installing rdoc 4.2.2
Installing tzinfo 1.2.2
Installing descendants_tracker 0.0.4
Installing nokogiri 1.6.7.2 with native extensions
Installing rack-test 0.6.3
Installing warden 1.2.6
Installing rack-protection 1.5.3
Installing rack-mini-profiler 0.9.9.2
Installing mail 2.6.4
Installing bourbon 4.2.6
Installing foreman 0.78.0
Installing coffee-script 2.4.1
Installing autoprefixer-rails 6.3.6
Installing uglifier 2.7.2
Installing sprockets 3.6.0
Installing haml 4.0.7
Installing launchy 2.4.3
Installing parser 2.3.0.7
Installing simplecov 0.11.2
Installing term-ansicolor 1.3.2
Installing unf 0.1.4
Installing thin 1.5.1 with native extensions
Installing flamegraph 0.1.0
Installing ruby_parser 3.8.1
An error occurred while installing pg (0.18.4), and Bundler cannot continue.
Make sure that `gem install pg -v '0.18.4'` succeeds before bundling.
vagrant@ylosix-vm:/vagrant$