Ruby gem mysql2 安装失败

Question

当我尝试安装 mysql2 gem 时，它失败了，没有明显的错误。有谁知道如何解决这个问题以便安装 mysql2？

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

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb
checking for rb_thread_blocking_region()... no
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lm... yes
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lz... yes
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lsocket... no
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lnsl... no
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lmygcc... no
checking for mysql_query() in -lmysqlclient... 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
    --without-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=/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
    --with-mysql-config
    --without-mysql-config
    --with-mysql-dir
    --without-mysql-dir
    --with-mysql-include
    --without-mysql-include=${mysql-dir}/include
    --with-mysql-lib
    --without-mysql-lib=${mysql-dir}/lib
    --with-mysqlclientlib
    --without-mysqlclientlib
    --with-mlib
    --without-mlib
    --with-mysqlclientlib
    --without-mysqlclientlib
    --with-zlib
    --without-zlib
    --with-mysqlclientlib
    --without-mysqlclientlib
    --with-socketlib
    --without-socketlib
    --with-mysqlclientlib
    --without-mysqlclientlib
    --with-nsllib
    --without-nsllib
    --with-mysqlclientlib
    --without-mysqlclientlib
    --with-mygcclib
    --without-mygcclib
    --with-mysqlclientlib
    --without-mysqlclientlib


Gem files will remain installed in /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6 for inspection.
Results logged to /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/ext/mysql2/gem_make.out

Answer 1

Ubuntu：

sudo apt-get install libmysqlclient-dev  #(mysql development headers)
sudo gem install mysql2 -- --with-mysql-dir=/etc/mysql/

就是这样！

结果：

Building native extensions. This could take a while...
Successfully installed mysql2-0.2.6
1 gem installed
Installing ri documentation for mysql2-0.2.6...
Enclosing class/module 'mMysql2' for class Result not known
Enclosing class/module 'mMysql2' for class Client not known
Installing RDoc documentation for mysql2-0.2.6...
Enclosing class/module 'mMysql2' for class Result not known
Enclosing class/module 'mMysql2' for class Client not known

Answer 2

您需要 mysql2 的 MySQL 开发头文件才能正确编译。这是必需的，因为大部分功能都是用 C 语言编写的，然后与 MySQL 相关联。

一种解决方案是将 gem 安装程序明确指向您的 mysql 安装文件夹，如下所示

gem install mysql2 -- --with-mysql-dir=/usr/local/mysql
# or where ever you installed your mysql server to

或通过将 mysql 服务器安装到已知位置（例如，通过使用 homebrew.）然后安装 gem

# install the mysql server locally
brew install mysql
# install the gem
gem install mysql2

这两种方法都要求您安装 XCode 才能拥有所需的 GCC 编译器。

Answer 3

您的机器上必须安装 64 位 MySQL，以及安装 xcode 时获得的构建工具。

Answer 4

安装 Brew 和 MySQL 后，我使用以下命令安装 mysql2 gem

gem install mysql2 -- --with-mysql-config=/usr/local/Cellar/mysql/5.5.10/bin/mysql_config

如果您使用的是 Bundler，您可以使用以下命令告诉 bundler：

bundle config build.mysql2 --with-mysql-config=/usr/local//Cellar/mysql/5.5.10/bin/mysql_config

如此处所述：http://gembundler.com/man/bundle-config.1.html

Answer 5

在 Mac OSX Moutain Lion 上，以下命令对我有用：

gem install mysql2 -- --srcdir=/usr/local/mysql/include

Answer 6

Ubuntu 15.04：

sudo apt-get install libmysqlclient-dev
sudo gem install mysql2

Ubuntu-16.04：

sudo apt-get install ruby-mysql2
sudo gem install mysql2

输出：

Building native extensions.  This could take a while...
Successfully installed mysql2-0.3.19
Parsing documentation for mysql2-0.3.19
Installing ri documentation for mysql2-0.3.19
Done installing documentation for mysql2 after 0 seconds
1 gem installed

Answer 7

您可能想在 MySQL 网站上查看此线程：http://forums.mysql.com/read.php?116,178217,178217，尤其是 Scott Derrick 的回答：http://forums.mysql.com/read.php?116,178217,189357#msg-189357

更具体地说，尝试使用

sudo gem install mysql2 -- --with-mysql-dir=/usr/local/mysql

希望对您有所帮助。

Answer 8

我在互联网和 Stack Overflow 上挖了 2 天，直到我找到 this link 然后开始通过 this ticket for mysql2 工作，我才真正解决了这个问题。

使用我的设置（如票证中所述），-Wno-null-conversion -Wno-unused-private-field 的编译器开关会中断并给我一个不完全正确的错误，即：

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

Answer 9

我通过指定目录在哪里解决了这个问题，不需要重新安装任何东西，使用 brew 或 macports 或其他任何东西，只需指定东西在哪里（只有一件事：红宝石我的mac是用rvm安装的，我没有使用os x自带的默认）：

将下面的标志添加到您的gem install mysql2

• --srcdir="..." - 包括
• --with-mysql-dir="..." - mysql目录
• --with-mysql-config="..." - mysql_config 文件

喜欢这个gem install mysql2 --srcdir=/usr/local/mysql/include/ --with-mysql-dir=/usr/local/mysql --with-mysql-config=/usr/local/mysql/bin/mysql_config

Answer 10

在 Centos 6.x（7 应该可以工作）中使用 SCL（软件集合）rh-mysql：

scl enable rh-mysql56 bash
gem install mysql2 -v '0.4.5' -- --with-mysql-include=/opt/rh/rh-mysql56/root/usr/include --with-mysql-lib=/opt/rh/rh-mysql56/root/usr/lib64

Answer 11

我猜如果你在目录中输入rvm use ruby-2.1.0@rails4.0 --create，那么bundle install 就可以了。