Ruby on rails 安装pg-v 0.17.1

我正在使用/我想使用Postgresql作为数据库，但当我键入bundle install或bundle update时，出现此错误，我该如何修复此错误

    Installing pg (0.17.1) with native extensions 
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

        /usr/local/rvm/rubies/ruby-1.9.3-p392/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-1.9.3-p392/bin/ruby
    --with-pg
    --without-pg
    --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


Gem files will remain installed in /Users/rsvmrk/.bundler/tmp/22196/gems/pg-0.17.1 for inspection.
Results logged to /Users/rsvmrk/.bundler/tmp/22196/gems/pg-0.17.1/ext/gem_make.out
An error occurred while installing pg (0.17.1), and Bundler cannot continue.
Make sure that `gem install pg -v '0.17.1'` succeeds before bundling.

---

有什么建议吗？

看起来您缺少必备的库

sudo apt-get install libpq-dev postgresql-devel

然后安装pg

gem install pg

---

为了与PostgreSQL数据库后端通信，您需要libpq dev包

然后继续安装包

gem install pg

---

对于使用OS X的用户，我建议使用home brew安装：

brew install postgresql

---

更多信息，如果您还不是用户，包括如何设置。

您是否安装了PostgreSQL 8.4.x或更高版本，并按照建议安装了标头、-dev软件包等：我尝试过使用该命令，但终端显示：sudo:apt get:command not foundapt get未安装在您的系统上，我希望您的系统上安装了wget。运行wget，然后运行sudo dpkg-i apt_0.9.7.7ubuntu4_amd64.0，希望您有64位系统。嗯。。。什么也没发生。仍然找不到命令。有没有一个特别的地方可以安装这些命令？请查看

brew install postgresql