我使用的是Ruby on Rails 3.1预版本。我喜欢使用PostgreSQL,但问题是安装pg gem。它给了我以下错误:

$ gem install pg
Building native extensions.  This could take a while...
ERROR:  Error installing pg:
    ERROR: Failed to build gem native extension.

        /home/u/.rvm/rubies/ruby-1.9.2-p0/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=/home/u/.rvm/rubies/ruby-1.9.2-p0/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 /home/u/.rvm/gems/ruby-1.9.2-p0/gems/pg-0.11.0 for inspection.
    Results logged to /home/u/.rvm/gems/ruby-1.9.2-p0/gems/pg-0.11.0/ext/gem_make.out

我怎么解决这个问题?


当前回答

在Arch Linux上,你需要安装postgresql-libs:

sudo pacman -Syu postgresql-libs

其他回答

在CentOS 6.5(挤压)下,我创建了一个文件:

$ sudo touch /etc/profile.d/psql.sh

与内容:

pathmunge /usr/pgsql-9.3/bin

注意这里,你应该用pg_config文件设置你的PostgreSQL路径。你可以通过以下命令找到:

$ sudo find / -iname pg_config

保存文件:

$ sudo chmod +x /etc/profile.d/ruby.sh

然后再试着执行你的命令。

注意:任何时候你改变Bash配置-改变概要文件。d配置-您应该重新加载Bash。

在OS X和MacPorts上,PostgreSQL不再需要-devel包。安装pg gem的步骤如下:

~ > sudo port install postgresql-devel
...
Error: postgresql-devel has been replaced by postgresql91; please install that port instead
~ > gem install pg -v '0.17.1' -- --with-pg-config=/opt/local/lib/postgresql95/bin/pg_config

参见这篇文章。

我刚刚在OSX上运行了brew和postgres@9.4。

我的解决方案是这样的:

CONFIGURE_ARGS="with-pg-include=/usr/local/opt/postgresql@9.4/include/" bundle install

在macOS(以前的Mac OS X和OS X)上,使用Homebrew安装正确的头文件:

brew install postgresql

然后运行

gem install pg

应该工作。

或者,不安装整个postgresql,你可以酿造安装libpq并导出正确的PATH和PKG_CONFIG_PATH,如“警告”部分所述

看起来在Ubuntu中,头文件是libpq-dev包的一部分(至少在以下Ubuntu版本中是这样的: 11.04 (Natty Narwhal), 10.04 (Lucid Lynx), 11.10 (Oneiric Ocelot), 12.04 (Precise穿山甲),14.04 (Trusty Tahr)和18.04(仿生海狸)):

...
/usr/include/postgresql/libpq-fe.h
...

所以试着为你的操作系统安装libpq-dev或类似的软件:

Ubuntu/Debian系统:sudo apt-get install libpq-dev RHEL系统:yum install postgresql-devel 对于Mac Homebrew: brew安装postgresql 对于Mac MacPorts PostgreSQL: gem install pg -- --with-pg-config=/opt/local/lib/ PostgreSQL[版本号]/bin/pg_config . exe OpenSuse:在postgresql-devel中使用zypper 对于ArchLinux: pacman -S postgresql-libs