Why Can\'t I Install the mysql Gem? (Failed to Build Native Extension: Header Files Not Found)

Failed to Build Gem Native Extension: Header Files Not Found

When attempting to install the mysql gem, users may encounter the error message "Failed to build gem native extension. /usr/bin/ruby extconf.rbnmkmf.rb can't find header files for ruby at /usr/lib/ruby/ruby.h." This issue arises due to the absence of Ruby headers during the gem installation process.

Solution:

To resolve this issue, users need to install the corresponding Ruby headers package, which provides the necessary header files for building native extensions.

Fedora:

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

Debian:

sudo apt-get install ruby-dev

Ubuntu:

sudo apt-get install ruby-all-dev

For earlier versions of Ruby, the appropriate development header package should be installed:

sudo apt-get install ruby[version]-dev

(where [version] is the desired Ruby version)

Once the Ruby headers are installed, re-running the gem install mysql command should successfully build the native extension and install the gem.

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