Hello ruby devs Am trying to install iruby on a windows machine and this error keeps appearing. Am currently doing some deep learning and I need to use sciruby and iruby to perform the actions required PS C:\> gem install irubyTemporarily enhancing PATH to include DevKit...Building native extensions. This could take a while... ERROR: Error installing iruby: ERROR: Failed to build gem native extension. C:/RailsInstaller/Ruby2.1.0/bin/ruby.exe -r ./siteconf20150710-76680-1u0zekx.rb extconf.rb checking for windows.h... yes checking for winsock.h... yes checking for main() in -lkernel32... yes checking for main() in -lrpcrt4... yes checking for main() in -lgdi32... yes*** extconf.rb failed ***Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=C:/RailsInstaller/Ruby2.1.0/bin/ruby --with-kernel32lib --without-kernel32lib --with-rpcrt4lib --without-rpcrt4lib --with-gdi32lib --without-gdi32lib extconf.rb:49:in `<main>': uninitialized constant GNU_CHAIN (NameError) extconf failed, exit code 1 Gem files will remain installed in C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rbczmq-1.7.9 for inspection. Results logged to C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/extensions/x86-mingw32/2.1.0/rbczmq-1.7.9/gem_make.out Please help