为Heroku安装PostgreSQL gem pq

Question

这里的第一个问题，但现在我想非常感谢你，因为stackoverflow在michael hartl tut的第一章就帮助了我近15次。

现在，我正在尝试使用以下命令安装PostgreSQL (pg gem)：

`

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

但是它显示了一个错误

-bash: group: command not found

然后我尝试直接安装(?)带宝石的

gem install pg

但是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 ***

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=/Users/trabalho/.rvm/rubies/ruby-2.0.0-p353/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}/

extconf failed, exit code 1

Gem files will remain installed in .rvm/gems/ruby-2.0.0-p353@railstutorial_rails_4_0/gems/pg-0.17.1 for inspection.
Results logged to .rvm/gems/ruby-2.0.0-p353@railstutorial_rails_4_0/extensions/x86_64-darwin-10/2.0.0/pg-0.17.1/gem_make.out`

我不知道它是不是安装好了，也不知道怎么确认。如何让group命令正常工作？或者如何安装gem pg和rails_12factor？有什么帮助吗？

Answer 1

你在运行ubuntu吗？看起来你需要这个库：

sudo apt-get install libpq-dev

Source

Answer 2

您不希望将group ...作为命令从终端运行，而是将该代码块放在rails应用程序的Gemfile中。

Gemfile

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

然后运行bundle命令。

如果您仍然不能以这种方式编译OSX，那么您需要确保您已经安装了pg命令行工具(假设您正在使用OSX.要安装这些工具，只需从您的终端运行xcode-select --install并按照提示操作即可。

Answer 3

sudo apt-get install libpq-dev 

它在Ubuntu上帮了我的忙