无法安装mysql2 gem OS X Mountain Lion
我是RoR的新手，我正在尝试安装Mysql2 -v’0.3.11’。 我有OS X Mountain Lion，rails 3.2.6，ruby 1.9.3。
以下是我得到的错误。 我到处看，没找到任何东西。
$gem install mysql2 -v '0.3.11' Building native extensions. This could take a while... ERROR: Error installing mysql2: ERROR: Failed to build gem native extension. /Users/curiosity/.rvm/rubies/ruby-1.9.3-p125/bin/ruby extconf.rb checking for rb_thread_blocking_region()... yes checking for rb_wait_for_single_fd()... yes checking for mysql.h... yes checking for errmsg.h... yes checking for mysqld_error.h... yes creating Makefile make compiling client.c In file included from client.c:1: In file included from ./mysql2_ext.h:8: In file included from /Users/curiosity/.rvm/rubies/ruby-1.9.3-p125/include/ruby-1.9.1/ruby.h:32: /Users/curiosity/.rvm/rubies/ruby-1.9.3-p125/include/ruby-1.9.1/ruby/ruby.h:105:37: error: 'ruby_check_sizeof_long' declared as an array with a negative size typedef char ruby_check_sizeof_long[SIZEOF_LONG == sizeof(long) ? 1 : -1]; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /Users/curiosity/.rvm/rubies/ruby-1.9.3-p125/include/ruby-1.9.1/x86_64-darwin12.0.0/ruby/config.h:24:21: note: expanded from macro 'SIZEOF_LONG' #define SIZEOF_LONG 8 ^ In file included from client.c:1: In file included from ./mysql2_ext.h:8: In file included from /Users/curiosity/.rvm/rubies/ruby-1.9.3-p125/include/ruby-1.9.1/ruby.h:32: /Users/curiosity/.rvm/rubies/ruby-1.9.3-p125/include/ruby-1.9.1/ruby/ruby.h:109:38: error: 'ruby_check_sizeof_voidp' declared as an array with a negative size typedef char ruby_check_sizeof_voidp[SIZEOF_VOIDP == sizeof(void*) ? 1 : -1]; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /Users/curiosity/.rvm/rubies/ruby-1.9.3-p125/include/ruby-1.9.1/x86_64-darwin12.0.0/ruby/config.h:28:22: note: expanded from macro 'SIZEOF_VOIDP' #define SIZEOF_VOIDP 8 ^ In file included from client.c:1: In file included from ./mysql2_ext.h:8: In file included from /Users/curiosity/.rvm/rubies/ruby-1.9.3-p125/include/ruby-1.9.1/ruby.h:32: In file included from /Users/curiosity/.rvm/rubies/ruby-1.9.3-p125/include/ruby-1.9.1/ruby/ruby.h:1377: In file included from /Users/curiosity/.rvm/rubies/ruby-1.9.3-p125/include/ruby-1.9.1/ruby/intern.h:34: /Users/curiosity/.rvm/rubies/ruby-1.9.3-p125/include/ruby-1.9.1/ruby/st.h:67:45: error: 'st_check_for_sizeof_st_index_t' declared as an array with a negative size typedef char st_check_for_sizeof_st_index_t[SIZEOF_VOIDP == (int)sizeof(st_index_t) ? 1 : -1]; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /Users/curiosity/.rvm/rubies/ruby-1.9.3-p125/include/ruby-1.9.1/x86_64-darwin12.0.0/ruby/config.h:28:22: note: expanded from macro 'SIZEOF_VOIDP' #define SIZEOF_VOIDP 8 ^ 3 errors generated. make: *** [client.o] Error 1 Gem files will remain installed in /Users/curiosity/.rvm/gems/ruby-1.9.3-p125/gems/mysql2-0.3.11 for inspection. Results logged to /Users/curiosity/.rvm/gems/ruby-1.9.3-p125/gems/mysql2-0.3.11/ext/mysql2/gem_make.out 谢谢你的帮助。
您正在使用RVM而不是10.8附带的Ruby。 好。 现在，停止使用10.8附带的MySQL。
安装和更新Homebrew 。 现在跑
brew install mysql
使用项目中的/Gemfile安装mysql2 gem。 加
gem "mysql2"
到你的/Gemfile 。 然后通过运行使用Bundler更新您的应用程序
bundle install
让包管理员（Homebrew和Bundler）为您服务。
这应该可以解决您遇到的问题。
正如Deefour所说，我不得不使用RVM。 回答他，我无法评论他的回答。 +1
但是rvm exec bundle install给了我一个错误：
rvm do bundle install被删除了，使用rvm 1.9.2,1.9.3 do bundle install或者rvm all do bundle install而不是。
我使用sudo rvm all do bundle install ， sudo rvm all do bundle install它们都完美无瑕。
我在mac10.10中也得到了相同类型的错误，并在下面用于我的命令中使用：
-
使用以下命令安装和升级Homebrew：
brew安装mysql
-
运行使用以下命令安装Mysql gem文件：
gem install mysql2 -v’0.3.11′
-
运行捆绑安装