RubyInstaller DevKit 4.5.1 Released

Just in time for your holiday hacking, the RubyInstaller for Windows
project [1] is pleased to announce its latest release of the DevKit [2]
providing MinGW GCC v4.5.1 capabilities for Ruby on Windows users.

The DevKit is a powerful compiler toolchain focused on making it easy to
use, build, and develop native RubyGems on Windows platforms. Since the
DevKit is used to build the MRI-based RubyInstaller and it’s required
native dependencies, it’s an integral component of the RubyInstaller
project. Many RubyInstaller users have also discovered the DevKit is a
useful toolchain for building other native projects on Windows.

While the DevKit will remain primarily a foundational build toolkit,
expandable to meet your unique needs, it will continue to be enhanced
for functional and ease-of-use reasons. Enhancements in this version

  • default toolchain is now TDM-based gcc/g++ v4.5.1
  • enhanced installation and upgrade behavior
  • easier 3rd party integration
  • initial support for JRuby cext (C-extensions) [3], [4], [5]
  • expanded core functionality (libtool, automake, mintty)
  • modularized build recipes for building TDM, TDM 64-bit, and LLVM-GCC
    Windows toolchains

…with the full list and usage instructions available at [6].

== QuickStart ==

After installing/upgrading [7] you may want to use a native RubyGem such
as RDiscount. Simply type “gem install rdiscount --platform=ruby” and
have at it.

Or you may want to build the latest EventMachine code from your cloned
repo. A “rake -rdevkit clobber compile” from your repo root dir should
get you going.

Or maybe you’re developing a native RubyGem and want to manually build
the native extension. Type “ruby -rdevkit extconf.rb” and you’ve got
your Makefile.

Or maybe you’d like to try building another native package from source.
Something like “c:\devkit\devkitvars.bat” (or “c:\devkit\devkitvars.ps1”
for you PowerShell users) will bring all the DevKit tools onto your
PATH, ready to help you build the code.

Or maybe you’d like to build [8] your own self-extracting DevKit, say an
LLVM-GCC v2.8 32-bit version. No problem. Simply clone the
RubyInstaller repo and…

C:>git clone git://
C:>cd rubyinstaller
C:\rubyinstaller>rake devkit sfx=1 dkver=llvm-32-2.8

However you decide to use the DevKit, we hope you find it makes your
Ruby on Windows experience a lot more rewarding and productive.

If after reading the documentation you run into problems or have
questions, drop by our helpful and friendly Google Group at


[2] Downloads
[3] - Productivity Blog
[7] Development Kit · oneclick/rubyinstaller Wiki · GitHub