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

在macOS (El Capitan)上。你可以简单使用:brew install postgresql

2016-01-07 16:50:14

我在Linux (Pop_OS) 20.10上使用Ruby(和其他版本)的版本管理器(asdf)，在尝试了100万种不同的方法对其进行排序后，包括上述所有内容

TLDR

gem install pg -v '1.2.3' -- --with-pg-config='/home/username/.asdf/installs/postgres/12.6/bin/pg_config'

找到正确版本的PG install，并指向bin目录中的pg_config

2021-05-03 03:21:56

回答: 不能在Windows上安装pg gem

的Windows原生版本 pg的最新版本(0.10.0)已经发布昨天，但如果你安装了0.9.0它是否应该安装二进制文件问题。

2011-01-28 10:34:51

pg gem需要绑定postgresql客户端库。这个错误通常意味着它找不到你的Postgres库。要么你没有安装它们，要么你可能需要传递——with-pg-dir=到你的gem安装中。

2011-01-28 18:14:10

我有个问题，这个方法对我很管用:

安装postgresql-devel包，这将解决pg_config缺失的问题。

sudo apt-get install libpq-dev

2011-05-23 10:09:41

无法安装pg gem

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