终端中“捆绑安装”的结果：
An error occurred while installing pg (0.16.0), and Bundler cannot continue.
Make sure that `gem install pg -v '0.16.0'` succeeds before bundling.
终端中“哪个psql”的结果：
/usr/bin/psql
/ etc / paths看起来像这样：
/usr/bin
/bin
/usr/sbin
/sbin
/usr/local/bin
/Applications/Postgres93.app/Contents/MacOS/bin
gem install pg的结果
/usr/local/rvm/rubies/ruby-1.9.3-p194/bin/gem:4: warning: Insecure world writable dir /usr/local in PATH, mode 040777
Building native extensions. This could take a while...
ERROR: Error installing pg:
ERROR: Failed to build gem native extension.
/usr/local/rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb
brew install postgres的结果：
Warning: A newer Command Line Tools release is available
The standalone package can be obtained from
https://developer.apple.com/downloads/,
or it can be installed via Xcode's preferences.
==> Downloading https://downloads.sf.net/project/machomebrew/Bottles/postgresql-
######################################################################## 100.0%
==> Pouring postgresql-9.3.2.mountain_lion.bottle.tar.gz
==> Caveats
If builds of PostgreSQL 9 are failing and you have version 8.x installed,
you may need to remove the previous version first. See:
https://github.com/Homebrew/homebrew/issues/issue/2510
To migrate existing data from a previous major version (pre-9.3) of PostgreSQL, see:
http://www.postgresql.org/docs/9.3/static/upgrading.html
When installing the postgres gem, including ARCHFLAGS is recommended:
ARCHFLAGS="-arch x86_64" gem install pg
To install gems without sudo, see the Homebrew wiki.
To have launchd start postgresql at login:
ln -sfv /usr/local/opt/postgresql/*.plist ~/Library/LaunchAgents
Then to load postgresql now:
launchctl load ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
Or, if you don't want/need launchctl, you can just run:
postgres -D /usr/local/var/postgres
Warning: Could not link postgresql. Unlinking...
Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
You can try again using `brew link postgresql'
Possible conflicting files are:
Warning: Could not link postgresql. Unlinking...
Error: Permission denied - /usr/local/lib/pkgconfig
不确定我还能尝试什么 - 我也安装了Postgres应用程序。