Rails 3 - 无法安装pg gem

Question

当我尝试运行bundle(bundle install)时,我总是得到

Installing pg (0.13.2) with native extensions 
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

        /Users/ryan/.rvm/rubies/ruby-1.9.2-p290/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=/Users/ryan/.rvm/rubies/ruby-1.9.2-p290/bin/ruby
    --with-pg
    --without-pg
    --with-pg-dir
    --without-pg-dir
    --with-pg-include
    --without-pg-include=${pg-dir}/include
    --with-pg-lib
    --without-pg-lib=${pg-dir}/lib
    --with-pg-config
    --without-pg-config
    --with-pg_config
    --without-pg_config


Gem files will remain installed in /Users/ryan/.rvm/gems/ruby-1.9.2-p290/gems/pg-0.13.2 for inspection.
Results logged to /Users/ryan/.rvm/gems/ruby-1.9.2-p290/gems/pg-0.13.2/ext/gem_make.out
An error occured while installing pg (0.13.2), and Bundler cannot continue.
Make sure that `gem install pg -v '0.13.2'` succeeds before bundling.

我使用的是Mac OS X 10.6,安装的PostgreSQL的版本是9.1.我发现问题出在libpq-dev中,我怎么能安装/修复它？

Answer 1

如果你在Linux上运行,你可能会对我有用的东西感兴趣:

sudo apt-get install postgresql
sudo apt-get install libpq-dev

然后

gem install pg

然后

bundle install

src:http://wikimatze.de/installing-postgresql-gem-under-ubuntu-and-mac

Answer 2

如您的错误日志中所述,您需要传递pg_config的路径.尝试使用以下方法安装gem:

gem install pg -- --with-pg-config= 'PATH_TO_YOUR_PG_CONFIG'

如果您不确定pg_config的位置,并假设您使用的是Linux或Mac,则可以运行以下命令:

which pg_config

您的pg-config可以位于不同的位置,具体取决于您安装postgres的方式.

Answer 3

如果您正在使用Postgress.app,那么您将需要访问其命令行工具.在终端或PATH配置文件中输入以下行:

 PATH="/Applications/Postgres.app/Contents/MacOS/bin:$PATH"

gem install pg现在应该工作.(这对我有用.)

注意新版本路径如下所示:

/Applications/Postgres.app/Contents/Versions/<version>/bin

Answer 4

如果你有自制软件,只需输入:

$ brew install postgresql

如果您没有,请在终端中输入以下内容:

ruby -e"$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"

Answer 5

搜索libpq:

brew search libpq

应输出 libpqxx

然后尝试安装它:

brew install libpqxx

Answer 6

您只需要安装libpq-dev:

sudo apt-get install libpq-dev

然后宝石应该安装得很好.

Answer 7

按照安装后的说明进行操作:http://postgresapp.com/documentation/configuration-ruby.html

要安装pg gem,请确保已正确设置$ PATH(如http://postgresapp.com/documentation/cli-tools.html中所述),然后运行

sudo ARCHFLAGS="-arch x86_64" gem install pg

我强烈建议您阅读这两页.只是撇去它们,失去了我生命中的一小时.读它们,问题解决了.