I can't run “bundle update” because of “mysql2” gem

问题

I have this in the Gemfile:

gem 'mysql2'

But when I run bundle update, I get this error message:

An error occurred while installing mysql2 (0.3.16), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.3.16'` succeeds before bundling.

I've tried to move this into the production section, like this:

group :production do
  gem 'mysql2'
end

But after running bundle update, the result is the same. This section is processed only in the production mode, or not?

How to get rid of this error message on localhost?

EDIT: The whole error message:

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

        /Users/radek/.rvm/rubies/ruby-1.9.3-p385/bin/ruby extconf.rb
checking for ruby/thread.h... *** 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
    --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/radek/.rvm/rubies/ruby-1.9.3-p385/bin/ruby
/Users/radek/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
    from /Users/radek/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/mkmf.rb:506:in `try_cpp'
    from /Users/radek/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/mkmf.rb:931:in `block in have_header'
    from /Users/radek/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/mkmf.rb:790:in `block in checking_for'
    from /Users/radek/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/mkmf.rb:284:in `block (2 levels) in postpone'
    from /Users/radek/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/mkmf.rb:254:in `open'
    from /Users/radek/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/mkmf.rb:284:in `block in postpone'
    from /Users/radek/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/mkmf.rb:254:in `open'
    from /Users/radek/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/mkmf.rb:280:in `postpone'
    from /Users/radek/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/mkmf.rb:789:in `checking_for'
    from /Users/radek/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/mkmf.rb:930:in `have_header'
    from extconf.rb:9:in `<main>'


Gem files will remain installed in /Users/radek/.rvm/gems/ruby-1.9.3-p385/gems/mysql2-0.3.16 for inspection.
Results logged to /Users/radek/.rvm/gems/ruby-1.9.3-p385/gems/mysql2-0.3.16/ext/mysql2/gem_make.out
An error occurred while installing mysql2 (0.3.16), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.3.16'` succeeds before bundling.

Thank you

回答1:

On Ubuntu, run

sudo apt-get install libmysqlclient-dev

Or, if you use MariaDB, run

sudo apt-get install libmariadbclient-dev

回答2:

Looks like there is no mysql2 gem installed in your machine.As you are using Mac OSX,you should be installing mysql2 gem like this

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

If the above command did't work,try like this

sudo gem install mysql -- --with-mysql-config=/usr/local/mysql/bin/mysql_config

And after try

bundle install

This should fix the error.

Source

回答3:

Add this in Gemfile:-

gem 'mysql2', '0.3.16'

Then:-

bundle install

After that try:-

bundle update

回答4:

I just installed mysql via $ brew install mysql and it fixed the problem.

回答5:

I've ended up with a near-identical error message from attempting to build on a machine without gcc-c++ installed; mkmf is failing to compile a simple c program because the compiler flat out isn't there.

If you're on CentOS, you want sudo yum install gcc-c++. On Ubuntu, it's sudo apt-get install g++. It's a little disappointing that old versions of ruby-devel don't have a dependency on g++.

来源：https://stackoverflow.com/questions/24009416/i-cant-run-bundle-update-because-of-mysql2-gem

标签

mysql

ruby-on-rails

ruby

gem

gemfile