安装 pg (0.17.1)时出错，Bundler 无法继续

我刚刚安装了 Rails 4.0.2，当创建一个新的应用程序时，在捆绑阶段我得到:

Installing pg (0.17.1)
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/Users/Dee/.rvm/rubies/ruby-2.0.0-p247/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.

我该怎么补救？

88342 次浏览
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Looks like you do not have PostgreSQL installed. The pg gem requires some headers from PostgreSQL to compile native extension.

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Some kind of error resported here Installing PG gem on OS X - failure to build native extension

To install dependencies on Ubuntu try this: 

sudo apt-get install libpq-dev

and this

gem install pg
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If gem install pg fails, try the following command:

env ARCHFLAGS="-arch x86_64" gem install pg -- --with-pg-config=/Applications/Postgres.app/Contents/MacOS/bin/pg_config

... from the PostgreSQL.app Documentation

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Previously working answer with older version

I installed under mac OSX Mavericks, having the postgres app (Version 9.2.2.0 ) from www.postgresapp.com installed. The underlying problem was simpy that the since postgres was installed via the app, the configuration file resides on a location which is not the default one when installing it without postgressapp. so we need to tell gem where to find this file by:

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

Hope it helps

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最佳答案

I'm on a Mac running Mavericks. My solution was to install Postgres.

And then in terminal install using homebrew with the configuration:

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

Note: This answer has been edited to use the latest symlink that is currently included in shipping versions of the Postgres app.

Previous versions suggested:

gem install pg -- --with-pg-config=/Applications/Postgres.app/Contents/Versions/9.4/bin/pg_config
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app root:

  1. brew update
  2. brew install postgres
  3. gem install pg -- --with-pg-config=/usr/local/Cellar/postgresql/9.3.4/bin/pg_config
  4. bundle install
  5. ln -sfv /usr/local/opt/postgresql/*.plist ~/Library/LaunchAgents
  6. launchctl load ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
  7. createuser -s -r postgres
  8. rake db:create:all
  9. rake db:migrate
  10. rails s

NOTE: replace the version number in step 3 if needed.

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After installing Postgres I had to run the following command

env ARCHFLAGS="-arch x86_64" gem install pg -- --with-pg-config=/Applications/Postgres.app/Contents/Versions/9.3/bin/pg_config

After this bundle install works great!

Hope it helps

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The way I managed to get past that error was:

  • cd to app folder and then set the ruby version locally. I'm using ruby 2.1.2.

rbenv local 2.1.2

  • instead of just running bundle install, install the gems in vendor/bundle

bundle install --path vendor/bundle

This did it for me.

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I had to combine everything and use 

sudo env ARCHFLAGS="-arch x86_64" gem install pg -- --with-pg-config=/Applications/Postgres.app/Contents/Versions/9.4/bin/pg_config
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If you are using something other than Postgres in development and Postgres in production only, you can add the pg gem to your gemfile like so...

group :production do
gem 'pg',             '0.17.1'
end

Then use bundle install --without production

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I needed to use sudo

sudo gem install pg -- --with-pg-config=/Applications/Postgres.app/Contents/Versions/9.5/bin/pg_config
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For CentOS users:

sudo yum install postgresql-devel

and

gem install pg
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It works for me

rvm list gemsets
rvm use ruby-2.4.1
bundle

error[![resolved with rvm use ruby]2

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I was having a problem with Amazon and couldn't use apt-get. For my worked:

    sudo yum install postgresql-devel

then:

    bundle install

and try again:

    rails serve
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If you installed through Homebrew; gem install pg -- --with-pg-config=/usr/local/bin/pg_config. Works with Ruby 2.4.6 and pg 0.20.0.

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I have just set up a new Macbook Pro which was prebuilt with Catalina.

What worked for me:

  1. Install the Postgres from here: https://postgresapp.com/
  2. Add export PATH="/Applications/Postgres.app/Contents/Versions/latest/bin:$PATH"to your .zshenv, since Z shell is now the default terminal.
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On mac this command worked for me.

gem install pg -v '0.18.4' -- --with-cflags="-Wno-error=implicit-function-declaration"


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