How to Fix \'Can\'t Find Header Files\' Errors During MySQL Gem Installation?

Failed Gem Installation: "Can't Find Header Files" Resolved

When attempting to install the MySQL gem on Fedora 14, you may encounter an error indicating that header files cannot be found. This issue stems from a missing component in your Ruby environment.

To resolve this problem and allow the gem to build successfully, you need to have the Ruby development headers installed. For different Linux distributions, this involves various commands:

Fedora:

yum -y install gcc mysql-devel ruby-devel rubygems

Debian and Debian-based distributions:

sudo apt-get install ruby-dev

Ubuntu:

sudo apt-get install ruby-all-dev

Earlier Ruby Versions (e.g., 2.2):

sudo apt-get install ruby2.2-dev

(Replace "2.2" with your desired Ruby version)

Once the Ruby development headers are installed, you can proceed with the gem installation command:

gem install -y mysql -- --with-mysql-config=/usr/bin/mysql_config

This should successfully build the gem's native extension and resolve the error. Remember to adjust the command syntax based on your specific operating system and Ruby version requirements.

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