Ruby gem mysql2安装失败

Question

当我尝试安装mysql2 gem时，它失败，没有明显的错误。 有谁知道该怎么办才能解决此问题，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/

而已！

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开发标头才能正确编译。 这是必需的，因为许多功能都是用C编写的，随后与MySQL链接在一起。

一种解决方法是像这样将gem安装程序直接指向您的mysql安装文件夹

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，使用homebrew ），然后安装gem

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

两种方法都要求您安装XCode才能具有所需的GCC编译器。

Answer 3

您必须在计算机上安装64位MySQL，以及安装xcode时获得的构建工具。

Answer 4

安装了Brew和MySQL之后，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，则可以通过以下命令告知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网站上检查此线程： http : //forums.mysql.com/read.php?116,178217,178217 ，特别是Scott Derrick的回答： http : //forums.mysql.com/ read.php？116,178217,189357＃msg-189357

具体来说，请尝试使用

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

希望能有所帮助。

Answer 8

我花了2天的时间浏览互联网和Stack Overflow，直到找到该链接 ，然后开始研究mysql2票证后 ，我才真正解决了该问题。

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，并给我一个错误，该错误并非完全正确，这是：

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

Answer 9

我猜想，如果您输入rvm use ruby-2.1.0@rails4.0 --create在您的目录中，然后进行bundle install 。

Answer 10

我通过具体说明目录在哪里来解决了这一问题， 无需通过brew或macports或任何东西重新安装任何东西，只需指定东西在哪里（只有一件事：我的Mac上的ruby是通过rvm安装的，不使用os x随附的默认值）：

将以下标志添加到您的gem install mysql2中

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

像这样的gem install mysql2 --srcdir=/usr/local/mysql/include/ --with-mysql-dir=/usr/local/mysql --with-mysql-config=/usr/local/mysql/bin/mysql_config

Answer 11

在具有SCL（软件集合）rh-mysql的Centos 6.x（应该可以使用7）中：

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