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问题:
I just installed Rails 4.0.2 and when creating a new app, in the bundle stage I get:
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.
How do I fix this?
回答1:
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
回答2:
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
回答3:
app root:
- brew update
- brew install postgres
- gem install pg -- --with-pg-config=/usr/local/Cellar/postgresql/9.3.4/bin/pg_config
- bundle install
- ln -sfv /usr/local/opt/postgresql/*.plist ~/Library/LaunchAgents
- launchctl load ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
- createuser -s -r postgres
- rake db:create:all
- rake db:migrate
- rails s
NOTE: replace the version number in step 3 if needed.
回答4:
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
回答5:
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
回答6:
Looks like you do not have PostgreSQL installed. The pg gem requires some headers from PostgreSQL to compile native extension.
回答7:
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
回答8:
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
回答9:
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
回答10:
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.
回答11:
I needed to use sudo
sudo gem install pg -- --with-pg-config=/Applications/Postgres.app/Contents/Versions/9.5/bin/pg_config
回答12:
For CentOS users:
sudo yum install postgresql-devel
and
gem install pg
回答13:
It works for me
rvm list gemsets rvm use ruby-2.4.1 bundle
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