How Do I Fix the 'Failed to build gem native extension' Error When Installing the mysql2 Gem?

Troubleshooting MySQL2 Gem Installation Error

When attempting to install the mysql2 gem for Ruby on Rails, you may encounter the "Failed to build gem native extension" error. This issue arises when the necessary dependencies for compiling the gem's native extensions are missing on your system.

Resolution

To resolve this issue and successfully install mysql2, you need to install the following packages:

Ubuntu/Debian and Other Distributions Using Aptitude

sudo apt-get install libmysql-ruby libmysqlclient-dev

Red Hat/CentOS and Other Distributions Using Yum

sudo yum install mysql-devel

Mac OS X with Homebrew

brew install mysql

Note: In Debian-based systems, libmysql-ruby has been replaced by ruby-mysql. If the first command fails, use:

sudo apt-get install libmysqlclient-dev

Once you have installed the required packages, retry the gem installation using bundle install or gem install mysql2. This should resolve the "Failed to build gem native extension" error and allow you to successfully use the mysql2 gem for connecting to MySQL databases from your Rails application.

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