An error occured while installing pg (0.11.0) 兰猫

今天运行一个rails app遇到个问题， 记录下

Installing pg (0.11.0) with native extensions 
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

        /usr/local/ruby/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/ruby/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 /home/ivan/.bundler/tmp/13344/gems/pg-0.11.0 for inspection.
Results logged to /home/ivan/.bundler/tmp/13344/gems/pg-0.11.0/ext/gem_make.out
An error occured while installing pg (0.11.0), and Bundler cannot continue.

错误提示   pg 0.11.0 无法安装， 这个gem 是我项目中用到的， 但是bundle 时无法顺利安装

google 了半天找到了解决方法， 原来是我的ubuntu 需要安装 package libpq-dev　　

so... 直接在ubuntu 软件中心找到这个包， 安装。

再次bundle install， 问题解决， 搞定收工！