Ruby on rails 运行故障'；轨道s'；安装OSXMavericks之后

在安装OSXMavericks之后，我无法让旧的Rails4应用程序工作。主要问题似乎是安装pg gem时出现问题：

Christophers-MacBook-Pro-2:DataSquid christopherspears$ gem install pg -v '0.17.1'
ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /Library/Ruby/Gems/2.0.0 directory.
Christophers-MacBook-Pro-2:DataSquid christopherspears$ sudo gem install pg -v '0.17.1'
Building native extensions.  This could take a while...
ERROR:  Error installing pg:
    ERROR: Failed to build gem native extension.

    /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/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=/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/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}/


Gem files will remain installed in /Library/Ruby/Gems/2.0.0/gems/pg-0.17.1 for inspection.
Results logged to /Library/Ruby/Gems/2.0.0/gems/pg-0.17.1/ext/gem_make.out

我不确定是什么问题。我确实为OS X Mavericks for Xcode安装了命令行工具（2013年10月底），但这并没有解决问题。

正如建议的那样，最简单的方法是安装然后运行

gem install pg -- --with-pg-config=/Applications/Postgres.app/Contents/Versions/9.3/bin/pg_config

---

使用Postgres.app

pg_config

安装pg gem，结果只是用brew卸载并重新安装了postgresql。这似乎奏效了。