小编lui*_*igi的帖子

第一个问题,但我现在非常感谢你,因为stackoverflow在michael hartl tut的第一章中帮了我近15次.

现在我正在尝试使用此命令安装PostgreSQL(pg gem):

`

    group :production do 
     gem 'pg', '0.15.1'
     gem 'rails_12factor', '0.0.2'
   end`

但它显示出错误

-bash: group: command not found

然后我尝试直接安装(？)宝石

gem install pg

但它显示了另一个错误

`Fetching: pg-0.17.1.gem (100%) 



Building native extensions.  This could take a while... 




 ERROR:  Error installing pg:
        ERROR: Failed to build gem native extension.



rvm/rubies/ruby-2.0.0-p353/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 *** …