Installing pg (0.11.0) with native extensions /usr/local/rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:533:in `rescue in block in build_extensions': ERROR: Failed to build gem native extension. (Gem::Installer::ExtensionBuildError)

        /usr/local/rvm/rubies/ruby-1.9.2-p180/bin/ruby 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=/usr/local/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
        --without-pg-config
        --with-pg_config
        --without-pg_config


Gem files will remain installed in /usr/local/rvm/gems/ruby-1.9.2-p180@rails3/gems/pg-0.11.0 for inspection.
Results logged to /usr/local/rvm/gems/ruby-1.9.2-p180@rails3/gems/pg-0.11.0/ext/gem_make.out
        from /usr/local/rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:511:in `block in build_extensions'
        from /usr/local/rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:486:in `each'
        from /usr/local/rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:486:in `build_extensions'
        from /usr/local/rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:159:in `install'
        from /usr/local/rvm/gems/ruby-1.9.2-p180@rails3/gems/bundler-1.0.12/lib/bundler/source.rb:96:in `install'
        from /usr/local/rvm/gems/ruby-1.9.2-p180@rails3/gems/bundler-1.0.12/lib/bundler/installer.rb:55:in `block in run'
        from /usr/local/rvm/gems/ruby-1.9.2-p180@rails3/gems/bundler-1.0.12/lib/bundler/spec_set.rb:12:in `block in each'
        from /usr/local/rvm/gems/ruby-1.9.2-p180@rails3/gems/bundler-1.0.12/lib/bundler/spec_set.rb:12:in `each'
        from /usr/local/rvm/gems/ruby-1.9.2-p180@rails3/gems/bundler-1.0.12/lib/bundler/spec_set.rb:12:in `each'
        from /usr/local/rvm/gems/ruby-1.9.2-p180@rails3/gems/bundler-1.0.12/lib/bundler/installer.rb:44:in `run'
        from /usr/local/rvm/gems/ruby-1.9.2-p180@rails3/gems/bundler-1.0.12/lib/bundler/installer.rb:8:in `install'
        from /usr/local/rvm/gems/ruby-1.9.2-p180@rails3/gems/bundler-1.0.12/lib/bundler/cli.rb:225:in `install'
        from /usr/local/rvm/gems/ruby-1.9.2-p180@rails3/gems/bundler-1.0.12/lib/bundler/vendor/thor/task.rb:22:in `run'
        from /usr/local/rvm/gems/ruby-1.9.2-p180@rails3/gems/bundler-1.0.12/lib/bundler/vendor/thor/invocation.rb:118:in `invoke_task'
        from /usr/local/rvm/gems/ruby-1.9.2-p180@rails3/gems/bundler-1.0.12/lib/bundler/vendor/thor.rb:246:in `dispatch'
        from /usr/local/rvm/gems/ruby-1.9.2-p180@rails3/gems/bundler-1.0.12/lib/bundler/vendor/thor/base.rb:389:in `start'
        from /usr/local/rvm/gems/ruby-1.9.2-p180@rails3/gems/bundler-1.0.12/bin/bundle:13:in `<top (required)>'
        from /usr/local/rvm/gems/ruby-1.9.2-p180@rails3/bin/bundle:19:in `load'
        from /usr/local/rvm/gems/ruby-1.9.2-p180@rails3/bin/bundle:19:in `<main>'