无法安装pg gem

我尝试使用宝石安装pg，但它似乎不工作。

Gem install pg给出这个错误

Temporarily enhancing PATH to include DevKit...
Building native extensions.  This could take a while...
ERROR:  Error installing pg:
        ERROR: Failed to build gem native extension.

C:/Ruby/bin/ruby.exe 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=C:/Ruby/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 C:/Ruby/lib/ruby/gems/1.8/gems/pg-0.10.1 for
inspection.
Results logged to C:/Ruby/lib/ruby/gems/1.8/gems/pg-0.10.1/ext/gem_make.out

当前回答

Ubuntu 20.10 (pop!_os) Ruby 2.7.2 Rails 3.1.0 Postgresql 12

卸载后重新安装postgresql-client libpq5 libpq-dev

sudo apt remove postgresql-client libpq5 libpq-dev
sudo apt install postgresql-client libpq5 libpq-dev

然后再次安装pg gem，指向/usr/lib，找到pg库:

gem install pg  --   --with-pg-lib=/usr/lib

输出(你应该在前面的命令之后看到的):

Building native extensions with: '--with-pg-lib=/usr/lib'
This could take a while...
Successfully installed pg-1.2.3
Parsing documentation for pg-1.2.3
Installing ri documentation for pg-1.2.3
Done installing documentation for pg after 1 seconds
1 gem installed

Gem应该安装，然后继续正常的bundle安装或更新:

bundle
bundle install
bundle update

2021-01-28 14:39:48

其他回答

$ PATH=$PATH:/Library/PostgreSQL/9.1/bin sudo gem install pg

将9.1版本替换为系统上安装的版本。

2012-02-29 05:52:57

这对我来说很管用:

sudo apt-get install libpq-dev

我使用:

Ubuntu 14.04.2 LTS 2.2.2红宝石 Rails 4.2.1

2015-06-16 13:53:46

多年来，我一直在PG身上遇到这个烦人的问题。我写了这个要点来帮助你。

下面的命令总是对我有用。

# Substitute Postgres.app/Contents/Versions/9.5 with appropriate version number
sudo ARCHFLAGS="-arch x86_64" gem install pg -- --with-pg-config=/Applications/Postgres.app/Contents/Versions/9.5/bin/pg_config

要点:https://gist.github.com/sharnie/5588340cf023fb177c8d

2018-03-21 14:34:17

Gem install pg -- --with-pg-config=/usr/pgsql-9.1/bin/pg_config

2012-02-10 23:21:18

Mac用户

PATH=$PATH:/Library/PostgreSQL/9.4/bin/ gem install pg

这应该能奏效

2015-03-10 05:40:46

无法安装pg gem

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