PostgreSQL gem pg 无法安装 [英] PostgreSQL gem pg was unable to install

问题描述

我的数据库是 PostgreSQL.我在 CENTOS 上......在安装 pg gem 时我收到以下错误.我也重新安装以清除我的 YAML 问题，但没有用，但这只是一个警告.我的主要问题是 pg gem 的安装:

My DB is PostgreSQL.I am on CENTOS.... While installing the pg gem I received the following error. I reinstalled to clear my YAML problem also, which didn't work, but it is just a warning. My main problem is the installation of the pg gem:

[root@vdimc04 ~]# gem install pg
/usr/local/lib/ruby/1.9.1/yaml.rb:56:in `<top (required)>':
It seems your ruby installation is missing psych (for YAML output).
To eliminate this warning, please install libyaml and reinstall your ruby.
Building native extensions.  This could take a while...
ERROR:  Error installing pg:
    ERROR: Failed to build gem native extension.

        /usr/local/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.

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=/usr/local/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 /usr/local/lib/ruby/gems/1.9.1/gems/pg-0.14.1 for inspection.
Results logged to /usr/local/lib/ruby/gems/1.9.1/gems/pg-0.14.1/ext/gem_make.out

我也尝试过以下命令，但没有用:

I also tried with the following command, but to no use:

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

推荐答案

我在 Centos 上遇到了同样的错误.通过谷歌搜索，我找到了两个要使用的命令:

I got the same error on Centos. By googling I found two commands to use:

1. yum install postgresql-libs -- 它给我消息说，它已经安装了.
2. yum install postgresql-devel -- 它解决了我与 pg_config 相关的错误，用于安装 'pg' .gem.

1. yum install postgresql-libs -- It gave me message saying, its already installed.
2. yum install postgresql-devel -- It solved my error related to pg_config for installing the 'pg' .gem.

希望有帮助:)

apos 写道:在 Ubuntu 14.04 上安装:

apos wrote: on Ubuntu 14.04 install:

1. apt-get install postgresql-server-dev-9.3 libpq-dev

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