当我运行bundle install时，我收到此错误：
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
current directory: /usr/local/lib/ruby/gems/2.3.0/gems/pg-0.18.4/ext
/usr/local/opt/ruby/bin/ruby -r ./siteconf20160601-64492-1nt86nq.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.
... [a long list of config options] ...
An error occurred while installing pg (0.18.4), and Bundler cannot continue.
Make sure that `gem install pg -v '0.18.4'` succeeds before bundling.
然后，当我尝试gem install pg -v '0.18.4'之类的建议时，我会得到相同的错误而没有建议运行我刚试过的命令。我没有运行postgres并且从未安装过它，所以我对为什么会这样做感到有些困惑。
这里有一个类似的问题，但同样，我没有postgresql。我需要它吗？问题：gem install pg -v 0.12.2 error on mac
感谢任何帮助。谢谢。
答案 0 :(得分：0)
是的，为了安装pg gem，您必须安装postgresql。您可以在their website上找到下载和安装说明。
具体来说，它说你需要一个pg_config文件，我想这将在安装时创建。