gem安装pg遇到问题

• 安装pg遇到问题

  #gem install pg

  报错信息为：

  Building native extensions. This could take a while...
  ERROR: Error installing pg:
  ERROR: Failed to build gem native extension.
  
  /usr/bin/ruby extconf.rb
  checking for pg_config... yes
  Using config values from /usr/bin/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}/lib64
  --with-make-prog
  --without-make-prog
  --srcdir=.
  --curdir
  --ruby=/usr/bin/ruby
  --with-pg
  --without-pg
  --with-pg-config
  --without-pg-config
  --with-pg_config
  --without-pg_config
  --with-pg-dir
  --without-pg-dir
  --with-pg-include
  --without-pg-include=${pg-dir}/include
  --with-pg-lib
  --without-pg-lib=${pg-dir}/
  
  
  Gem files will remain installed in /home/oss/.gem/ruby/gems/pg-0.17.1 for inspection.
  Results logged to /home/oss/.gem/ruby/gems/pg-0.17.1/ext/gem_make.out
  

  #=============================================================

  说明：

  注意看上边的报错信息（如下边这样的语句）：
  

  checking for libpq-fe.h... no
  Can't find the 'libpq-fe.h header

  你安装其他gem插件的时候也会遇到类似这样的问题，找不到什么什么.h这样的文件，就是缺少你安装的这个gem包的依赖包，一般都是安装xxxx-devel就能解决问题。

  例如我遇到的这个问题，安装postgresql这个数据库的依赖包就行了postgresql-devel，具体执行下面的命令即可
  

  #===================================================================
  

  解决方法：

  安装postgresql数据库的依赖包

  #yum install postgresql-devel

  安装好以后再安装pg这个gem包

  #gem install pg

  OK，搞定