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尝试安装pg gem，但失败了

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$ gem install pg
Building native extensions.  This could take a while...
ERROR:  Error installing pg:
ERROR: Failed to build gem native extension.

/Users/jtorkornoo/.rbenv/versions/2.1.2/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/jtorkornoo/.rbenv/versions/2.1.2/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}/lib

extconf failed, exit code 1

Gem files will remain installed in /Users/jtorkornoo/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/pg-0.17.1 for inspection.
Results logged to /Users/jtorkornoo/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/extensions/x86_64-darwin-14/2.1.0-static/pg-0.17.1/gem_make.out

gem file
source 'https://rubygems.org'

gem 'rails', '3.2.19'

# Bundle edge Rails instead:
# gem 'rails', :git => 'git://github.com/rails/rails.git'
group :development, :test do
  gem 'pg'
end






# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails',   '~> 3.2.3'
  gem 'coffee-rails', '~> 3.2.1'

  # See https://github.com/sstephenson/execjs#readme for more supported runtimes
  # gem 'therubyracer', :platforms => :ruby

  gem 'uglifier', '>= 1.0.3'
end

gem 'jquery-rails'

# To use ActiveModel has_secure_password
# gem 'bcrypt-ruby', '~> 3.0.0'

# To use Jbuilder templates for JSON
# gem 'jbuilder'

# Use unicorn as the app server
# gem 'unicorn'

# Deploy with Capistrano
# gem 'capistrano'

# To use debugger
# gem 'debugger'
ruby ruby-on-rails-3

1 回答

  • 1

    检查pg_config ...不

    是你的关键 .

    Ruby和gem无法找到PostgreSQL的pg_config文件所在的位置 . 你必须告诉他们，以便他们可以找出PostgreSQL存储其数据库和支持文件的位置 .

    您可以通过在运行 gem install pg 之前将PostgreSQL的bin目录添加到路径中来实现 . 您使用的是Mac OS，因此请尝试从命令行运行 locate pg_config . 你应该看到类似的东西：

    /Library/PostgreSQL/9.2/bin/pg_config

    作为返回的条目之一 . 如果不这样做，那么您没有安装PostgreSQL，或者您没有运行Spotlight或运行定位服务，这将填充用于查找文件的数据库 .

    我有一个脚本，我保存在〜/ bin目录中，我称之为“install_pg.sh”：

    #!/bin/sh -x

PATH=/Library/PostgreSQL/9.2/bin:$PATH
gem install pg

    这应该可以帮助您解决问题 .

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