无法安装pg gem

Question

我尝试使用,gem install pg但它似乎没有用.

gem install pg 给出了这个错误

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

Answer 1

我有这个问题,这对我有用:

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

sudo apt-get install libpq-dev

Answer 2

问题是gem依赖所以在安装pg之前确保你已经安装了"libpq-dev"

Ubuntu系统:

sudo apt-get install libpq-dev

RHEL系统:

yum install postgresql-devel

苹果电脑:

brew安装postgresql

Answer 3

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

Answer 4

@Winfield 说:

pg gem需要postgresql客户端库进行绑定.此错误通常意味着它无法找到您的Postgres库.要么您没有安装它们,要么您可能需要将它传递--with-pg-dir=给您的gem安装.

更重要的是,您只需要--with-pg-config=安装它.

在Mac上

如果,你有任何机会,你也通过mac上的网站捆绑安装了postgres,它将会在某个地方/Applications/Postgres.app/Contents/Versions/9.3/bin.

所以,要么你在gem安装上传递它:

gem install pg -- --with-pg-config=/Applications/Postgres.app/Contents/Versions/9.3/bin/pg_config

或者您正确设置PATH.由于这可能太多,暂时设置PATH:

export PATH=%PATH:/Applications/Postgres.app/Contents/Versions/9.3/bin/

Answer 5

我没有安装postgresql,所以我只是用它来安装它

sudo apt-get install postgresql postgresql-server-dev-9.1

在Ubuntu 12.04上.

这解决了它.

更新:

使用最新版本:

sudo apt-get install postgresql-9.3 postgresql-server-dev-9.3

Answer 6

在我的情况下工作,我使用ubuntu 14.04.2 LTS

sudo apt-get install libpq-dev

我用

Ruby 2.2.2和Rails 4.2.1

Answer 7

这里回答: 无法在Windows上安装pg gem

昨天发布的最新版本的pg(0.10.0)没有Windows原生版本,但如果安装0.9.0,它应该安装二进制文件而不会出现问题.

Answer 8

如果您在Mac 上使用Postgres.app,您可以一劳永逸地解决此问题,如下所示:

首先gem uninstall pg,然后编辑~/.bash_profile或~/.zshrc文件或同等学历,并添加:

# PostgreSQL bin path
export PATH=$PATH:/Applications/Postgres.app/Contents/Versions/9.4/bin

然后bundle install,gem install pg两者都应该按预期工作.

Answer 9

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

将9.1替换为系统上安装的版本.

Answer 10

在Mac OS(El Capitano)上.你可以简单地使用:brew install postgresql