Meet MSYS and the DevKit
Sometimes you just want RubyGems to build that cool native, C-based extension without squawking. Who’s your buddy? The DevKit that’s who!
MSYS2-DevKit (only Ruby >= 2.4)
Stating with RubyInstaller-2.4 we’re no longer using our own DevKit compilation, but make use of MSYS2 for both, building ruby itself, as well as building Ruby gems with C-extensions.
It can be installed per
ridk install command, which is part of RubyInstaller-2.4. Alternatively a manual download and installation from MSYS2 is also possible.
Dedicated DevKit (only Ruby < 2.4)
The RubyInstaller Development Kit is a toolkit that makes it easy to build and use native C/C++ extensions such as RDiscount and Nokogiri for Ruby on Windows. It is built upon MSYS1, which is no longer maintained, now. So you should upgrade to RubyInstaller-2.4 with makes use of MSYS2.
Simply download, double-click, choose an installation directory, run the Ruby install helper script and you’re ready to start using native Ruby extensions. For installation details check out the Development Kit wiki page.