Centos7 安装ruby gem mysql2

安装 mysql2

gem install mysql2 -v '0.5.3' --source 'https://gems.ruby-china.com/'

报错

Building native extensions.  This could take a while...
ERROR:  Error installing mysql2:
        ERROR: Failed to build gem native extension.

        /usr/local/rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb
checking for rb_thread_blocking_region()... yes
checking for rb_wait_for_single_fd()... yes
checking for mysql.h... no
checking for mysql/mysql.h... no
-----
mysql.h is missing.  please check your installation of mysql and try again.
-----
*** 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
--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/rvm/rubies/ruby-1.9.3-p194/bin/ruby
--with-mysql-config
--without-mysql-config


Gem files will remain installed in /usr/local/rvm/gems/ruby-1.9.3-p194/gems/mysql2-0.3.11       for inspection.
Results logged to /usr/local/rvm/gems/ruby-1.9.3-p194/gems/mysql2-    0.3.11/ext/mysql2/gem_make.out

解决

在 Ubuntu 和 Debian 中：

sudo apt-get install libmysqlclient-dev

在 Redhat 和 CentOS 中：

yum install mysql-devel

在 Mac OS X 中：

brew install mysql