我运行bundle update（这样我可以安装rails），但是出现了这个错误：
$ bundle update
..... < other stuff ....>
Installing pg (0.14.1) with native extensions
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/Users/user/.rvm/rubies/ruby-1.9.3-p374/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.
我是Ruby的新手，所有这一切，有人能告诉我这里有什么问题吗？
这是在OSX上
答案 0 :(得分：2)
确保先安装postgres。我建议您通过Mac包管理器homebrew进行此操作。
brew install postgresql
修改
看起来宝石无法找到你的postgres配置，这里有一个与你的问题类似的答案：