ruby-on-rails – rails中的活动记录postgresql适配器错误

rake aborted!
Please install the postgresql adapter: `gem install activerecord-postgresql-adap
ter` (pg is not part of the bundle. Add it to Gemfile.)

当我尝试安装pg适配器时,我得到了这个：

Temporarily enhancing PATH to include DevKit...
Building native extensions.  This could take a while...
ERROR:  Error installing activerecord-postgresql-adapter:
    ERROR: Failed to build gem native extension.

F:/Ruby200-x64/bin/ruby.exe 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

需要配置选项.

我的gemfile：

source 'https://rubygems.org'

gem 'rails','3.2.12'

# Bundle edge Rails instead:
# gem 'rails',:git => 'git://github.com/rails/rails.git'

gem "pg"

# Gems used only for assets and not required
# in production environments by default.
 group :assets do
  gem 'sass-rails','~> 3.2.3'
  gem 'coffee-rails','~> 3.2.1'

  # See https://github.com/sstephenson/execjs#readme for more supported runtimes
  # gem 'therubyracer',:platforms => :ruby

  gem 'uglifier','>= 1.0.3'
end

gem 'jquery-rails'

# To use ActiveModel has_secure_password
# gem 'bcrypt-ruby','~> 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'

知道吗？