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我在我的电脑上安装了 rails，根据这个指令制作 - https://coderwall.com/p/auvm9g
安装新项目时 - rails new my_project -d mysql

    Installing mysql2 (0.3.13) 
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

    /Users/albert/.rvm/rubies/ruby-1.9.3-head/bin/ruby extconf.rb 
checking for rb_thread_blocking_region()... yes
checking for rb_wait_for_single_fd()... yes
checking for rb_hash_dup()... yes
checking for rb_intern3()... 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.
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*** 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=/Users/albert/.rvm/rubies/ruby-1.9.3-head/bin/ruby
    --with-mysql-config
    --without-mysql-config


Gem files will remain installed in /Users/albert/.rvm/gems/ruby-1.9.3-head@kyrgyz-tours/gems/mysql2-0.3.13 for inspection.
Results logged to /Users/albert/.rvm/gems/ruby-1.9.3-head@kyrgyz-tours/gems/mysql2-0.3.13/ext/mysql2/gem_make.out

An error occurred while installing mysql2 (0.3.13), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.3.13'` succeeds before bundling.

谢谢你们！宝石 mysql2 已安装 :)

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1 回答 1

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您的错误似乎是您的系统中没有安装mysql，请安装mysql-server必要mysql-client的库，例如：libmysql-dev............

 -----
 mysql.h is missing.  please check your installation of mysql and try again.
 -----

你可以关注http://ariejan.net/2007/12/12/how-to-install-mysql-on-ubuntudebian/

如果 Mac 操作系统 http://www.randomactsofsentience.com/2013/05/gem-install-mysql2-missing-mysqlh-on-os.html

还

使用Homebrew或 MacPorts 之类的包管理器可以很直接地解决这个问题。直接来自 Oracle 的 MySQL 二进制发行版以及与 OS X 本身捆绑在一起的发行版没有开发头文件，其中 mysql.h 就是其中之一。

和 

brew install mysql
于 2013-09-04T05:45:31.473 回答