我已按照http://geryit.com/blog/2011/01/installing-mysql-with-rails-on-mac-os-x-snow-leopard/上的说明操作，包括通过macport安装ruby。
每当我执行 gem install mysql 时，我都会收到以下错误
bash-3.2# gem install mysql
Building native extensions. This could take a while...
ERROR: Error installing mysql:
ERROR: Failed to build gem native extension.
/opt/local/bin/ruby extconf.rb
checking for mysql_ssl_set()... no
checking for rb_str_set_len()... no
checking for rb_thread_start_timer()... no
checking for mysql.h... no
checking for mysql/mysql.h... no
*** 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=/opt/local/bin/ruby
--with-mysql-config
--without-mysql-config
Gem files will remain installed in /opt/local/lib/ruby/gems/1.8/gems/mysql-2.8.1 for inspection.
Results logged to /opt/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/ext/mysql_api/gem_make.out
如何解决此问题？我已经使用包文件（.pkg）安装了32位mysql，而且，我对ruby非常新...
更新4/26/11美国东部时间下午5:11
已安装RVM并更新了ruby到1.9.2
另外，我查看了评论中发布的链接。我做了locate mysql_config
结果是
/usr/local/mysql-5.1.56-osx10.6-x86/bin/mysql_config
/usr/local/mysql-5.1.56-osx10.6-x86/man/man1/mysql_config.1
因此，我试过了
gem install mysql - -with-mysql-config=/usr/local/mysql-5.1.56-osx10.6-x86/bin/mysql_config
但它仍然不起作用......但我确实得到了新的错误信息..
/Users/kyle/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/mkmf.rb:368:in `try_do': The complier failed to generate an executable file. (RuntimeError)
You have to install development tools first.
from /Users/kyle/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/mkmf.rb:435:in `try_link0'
from /Users/kyle/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/mkmf.rb:440:in `try_link'
from /Users/kyle/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/mkmf.rb:552:in `try_func'
from /Users/kyle/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/mkmf.rb:797:in `block in have_func'
from /Users/kyle/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/mkmf.rb:693:in `block in checking_for'
from /Users/kyle/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/mkmf.rb:280:in `block (2 levels) in postpone'
from /Users/kyle/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /Users/kyle/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/mkmf.rb:280:in `block in postpone'
from /Users/kyle/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/mkmf.rb:254:in `open'
from /Users/kyle/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/mkmf.rb:276:in `postpone'
from /Users/kyle/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/mkmf.rb:692:in `checking_for'
from /Users/kyle/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/mkmf.rb:796:in `have_func'
from extconf.rb:50:in `<main>'
Gem files will remain installed in /Users/kyle/.rvm/rubies/ruby-1.9.2-p180/bin/th-mysql-config=/usr/local/mysql-5.1.56-osx10.6-x86/bin/mysql_config/gems/mysql-2.8.1 for inspection.
真的要感谢那些评论过的人......非常感谢能给予更多的帮助.....一直试图安装这个darn mysql 2天......
答案 0 :(得分：17)
目前尚未安装程序'mysql_config'。 您可以输入以下命令安装它：
$ sudo apt-get install libmysqlclient-dev
$ bundle install
bundle show [mysql2] # To find the location.
答案 1 :(得分：11)
试试这个：
gem install mysql -- --with-mysql-config=/usr/local/mysql-5.1.56-osx10.6-x86/bin/mysql_config
（注意额外的破折号）
如果这不起作用，我强烈建议您使用MySQL上面提到的自制安装。你可以在这里阅读关于汤到坚果的安装：Uninstall Ruby on Rails on Mac OS X 10.6
答案 2 :(得分：9)
我在Cent OS中遇到了同样的问题，但是通过安装mysql-devel
解决了这个问题 yum install mysql mysql-server mysql-devel
答案 3 :(得分：5)
基于this answer我最终编辑了我的/usr/local/Cellar/mysql/5.6.12/bin/mysql_config文件以删除-Wno-null-conversion -Wno-unused-private-field，这就是mkmf.log抱怨的错误。
我的设置是Mac OSX，使用RVM安装Ruby，使用自制软件安装MySQL。
答案 4 :(得分：4)
通过卸载我的系统上的32位MySQL解决了这个问题..并安装了64.5位5.1.56。
希望这对那些和我有同样问题的人有所帮助。
答案 5 :(得分：3)
如果您使用bundler，则可以使用bundle config为您的宝石设置构建参数，这会将您的构建选项保存到~/.bundle/config，以便下次需要构建时你的宝石，配置选项已经设定，例如：
bundle config build.mysql --with-mysql-config=/usr/local/mysql/bin/mysql_config
答案 6 :(得分：2)
答案 7 :(得分：2)
从2018年11月开始适用于Mac
gem install mysql2 -v '0.4.8' -- --with-ldflags=-L/usr/local/opt/mysql@5.7/lib --with-cppflags=-I/usr/local/opt/mysql@5.7/include
答案 8 :(得分：0)
按照以下步骤