安装 pg gem 时遇到问题 [重复]答案

【问题标题】：Trouble installing the pg gem [duplicate]安装 pg gem 时遇到问题 [重复]
【发布时间】：2015-07-12 02:55:02
【问题描述】：

尝试在我的 Mac 上运行我的第一个 Rails 应用程序时，我遇到了拒绝访问错误。

当我运行 bundle install 时，我得到了

An error occurred while installing pg (0.18.1), and Bundler cannot continue.
Make sure that `gem install pg -v '0.18.1'` succeeds before bundling.

然后我运行gem install pg -v '0.18.1' 并得到以下错误

Building native extensions.  This could take a while...
ERROR:  Error installing pg:
ERROR: Failed to build gem native extension.
/Users/foo/.rvm/rubies/ruby-2.2.1/bin/ruby -r ./siteconf20150502-79500-1qqztpf.rb 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.
Gem files will remain installed in /Users/foo/.rvm/gems/ruby-2.2.1/gems/pg-0.18.1 for inspection.
Results logged to /Users/foo/.rvm/gems/ruby-2.2.1/extensions/x86_64-darwin-14/2.2.0-static/pg-0.18.1/gem_make.out

【问题讨论】：

查看这篇帖子stackoverflow.com/questions/6040583/…的答案
谢谢！那是我的懒惰。对不起

标签： ruby-on-rails ruby

【解决方案1】：

您是否只在生产环境中运行 PostgreSQL？在这种情况下，请确保它仅在您的 Gemfile 中分组用于生产：

group :production do 
  gem pg, '0.18.1'
end

之后，确保运行 bundle install 并声明不安装生产版 gem：

$ bundle install --without production

我希望这会有所帮助。

【讨论】：