Question

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

$ 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，后来又链接到MySQL。

解决方案是将gem安装程序明确指向您的mysql安装文件夹，如此

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

这两种方法都要求您安装XCode以获得所需的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

如果你正在使用Bundler，你可以通过命令告诉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 OS X Mountain Lion上，下面的命令对我有用：

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

Answer 6

Ubuntu 15.04：

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

Ubuntu的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网站上查看此主题：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

更具体一点，请尝试使用

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

希望有所帮助。

Answer 8

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

使用我的设置（如故障单中所述），-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：< / p>

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

Answer 9

我想如果您在目录中键入rvm use ruby-2.1.0@rails4.0 --create，那么bundle install就可以了。

Answer 10

我通过具体了解目录的位置来解决这个问题，无需重新安装任何东西，使用brew或macports等等，只需指定事物的位置（只有一件事：ruby on我的mac安装了rvm，我没有使用os x附带的默认值：

在gem install mysql2下面添加标记

--srcdir="..." - 包含
--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 11

在Centos 6.x（7应该工作）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

Ruby gem mysql2安装失败

11 个答案: