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pg gem 没有在 gem 文件中指定，为什么它不会安装，如果它不在 gem 文件中，为什么它甚至会安装。我正在尝试使用 mysql。

奇怪的是 pg gem 不在我的 gemfile 中，所以我认为它可能是另一个的依赖项，在研究了 gem 站点的依赖项之后，pg 显示不是使用的其他 gems 的依赖项。

错误信息：

Installing pg (0.8.0) with native extensions c:/Ruby192/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:543:in `rescue in block in build_e
xtensions': ERROR: Failed to build gem native extension. (Gem::Installer::ExtensionBuildError)

        c:/Ruby192/bin/ruby.exe extconf.rb
ERROR: can't find pg_config.
HINT: Make sure pg_config is in your PATH
*** 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

Gem files will remain installed in c:/Ruby192/lib/ruby/gems/1.9.1/gems/pg-0.8.0 for inspection.
Results logged to c:/Ruby192/lib/ruby/gems/1.9.1/gems/pg-0.8.0/ext/gem_make.out
        from c:/Ruby192/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:521:in `block in build_extensions'
        from c:/Ruby192/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:496:in `each'
        from c:/Ruby192/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:496:in `build_extensions'
        from c:/Ruby192/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:177:in `install'
        from c:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.12/lib/bundler/source.rb:96:in `install'
        from c:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.12/lib/bundler/installer.rb:55:in `block in run'
        from c:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.12/lib/bundler/spec_set.rb:12:in `block in each'
        from c:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.12/lib/bundler/spec_set.rb:12:in `each'
        from c:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.12/lib/bundler/spec_set.rb:12:in `each'
        from c:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.12/lib/bundler/installer.rb:44:in `run'
        from c:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.12/lib/bundler/installer.rb:8:in `install'
        from c:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.12/lib/bundler/cli.rb:225:in `install'
        from c:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.12/lib/bundler/vendor/thor/task.rb:22:in `run'
        from c:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.12/lib/bundler/vendor/thor/invocation.rb:118:in `invoke_task'
        from c:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.12/lib/bundler/vendor/thor.rb:246:in `dispatch'
        from c:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.12/lib/bundler/vendor/thor/base.rb:389:in `start'
        from c:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.12/bin/bundle:13:in `<top (required)>'
        from c:/Ruby192/bin/bundle:19:in `load'
        from c:/Ruby192/bin/bundle:19:in `<main>'

这是gemfile：

source :rubygems

gem "rails", ">= 3.0"
gem "rack"
gem "clearance", "0.9.0.rc9"
gem "haml"
gem "high_voltage"
gem "hoptoad_notifier"
gem "will_paginate"
gem "formtastic"
gem "dynamic_form"
gem "mysql"
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1 回答 1

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pg gem 用于从 ruby​​ 访问 PostgreSQL 数据库。检查您的 Gemfile.lock 以找出哪个 gem 需要它作为依赖项。

如果您确实需要使用 pg gem，请参阅此 Stack Overflow 问题。

于 2011-07-07T20:13:56.423 回答