Installing mysql2 gem for Ruby on Rails with Mac O

问题:

I am having a problem installing the mysql2 gem.

This comes up when I do gem install mysql2:

Marks-MacBook-Pro:~ Mark$ gem install mysql2
Building native extensions.  This could take a while...
ERROR:  Error installing mysql2:
ERROR: Failed to build gem native extension.

/Users/useruser/.rvm/rubies/ruby-1.9.2-p136/bin/ruby extconf.rb
checking for rb_thread_blocking_region()... yes
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=/Users/useruser/.rvm/rubies/ruby-1.9.2-p136/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 /Users/useruser/.rvm/gems/ruby-1.9.2-p136/gems/mysql2-0.2.6 for inspection.
Results logged to /Users/useruser/.rvm/gems/ruby-1.9.2-p136/gems/mysql2-0.2.6/ext/mysql2/gem_make.out

Also when I use rails server this comes up:

Could not find gem 'mysql2 (>= 0, runtime)' in any of the gem sources listed in your Gemfile.

回答1:

It seems that it cannot find the MySQL library. Have you installed MySQL?
Try installing it via homebrew:

brew install mysql

or install it via macports or fink or whatever you prefer and then try again with:

gem install mysql2

回答2:

This command worked for me:

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

回答3:

Following command worked for me successfully.

x.x.x = version of mysql2 you want to install.

gem install mysql2 -v 'x.x.x' -- --srcdir=/usr/local/mysql/include

回答4:

I don't need MySQL on Mac OS X, because I have MySQL installed on Vagrant box. Therefore, I just installed mysql-connector-c.

brew install mysql-connector-c
gem install mysql2

回答5:

The following worked for me

brew install mysql 
brew install mysql-connector-c
gem install mysql2

回答6:

You'll have to specify some additional environment variables to install this gem on the 64 bit architecture for Mac OSX 10.6:

env ARCHFLAGS="-arch x86_64" gem install mysql2

If you are using rvm you can add this as your default option in the ~/.rvmrc file:

rvm_archflags="-arch x86_64"

回答7:

If you used homebrew to install mysql, brew install mysql,this worked for me:

gem install mysql2 -v 'x.x.x' -- --with-mysql-config=/usr/local/Cellar/mysql/y.y.y/bin/mysql_config

x.x.x = version of the mysql2 gem you want to install
y.y.y = the version of mysql you have installed ls /usr/local/Cellar/mysql to find it.

to get the version of mysql

brew info mysql                                                                                                                                                                                                     
mysql: stable 5.7.19 (bottled)
               ...
/usr/local/Cellar/mysql/5.7.19 (322 files, 233MB) *

               ...

then if you want to install with bundle:

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

回答8:

I had the exact same issue and errors trying to install mysql2. I thought my mamp install of MySQL would work fine and spent a few hours playing around with paths to get that to work - no success.

Finally came across this post from ALoR and installed a fresh version through homebrew - however - be sure to follow ALL the instructions from homebrew! I missed a few steps and wasted another hour tracking down that problem - here are those instructions: https://stackoverflow.com/a/11061487/1241271

After MySQL was successfully installed, I ran: sudo gem install mysql2 and it worked like a charm.

Hope this helps someone from wasting several hours because they neglected to read the docs (newb mistake).