Ruby on Rails - can not install SystemTimer

I am using windows and I just ran the command: ``` C:\Sites\cmply>gem install SystemTimer -v '1.2.3' ``` and I got this error: ``` Temporarily enhancing PATH to include DevKit... Building native extensions. This could take a while... ERROR: Error installing SystemTimer: ERROR: Failed to build gem native extension. C:/RailsInstaller/Ruby1.9.3/bin/ruby.exe extconf.rb creating Makefile make generating system_timer_native-i386-mingw32.def compiling system_timer_native.c In file included from system_timer_native.c:8:0: c:/RailsInstaller/Ruby1.9.3/include/ruby-1.9.1/ruby/backward/rubysig.h:14:2: warning: #warning rubysig.h is obsolete system_timer_native.c: In function 'install_first_timer_and_save_original_configuration': ``` any idea why? Prior to this I got another suspicious error: ``` Gem files will remain installed in C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/SystemTimer-1.2.3 for inspection. Results logged to C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/SystemTimer-1.2.3/ext/system_timer/gem_make.out An error occured while installing SystemTimer (1.2.3), and Bundler cannot continue. Make sure that `gem install SystemTimer -v '1.2.3'` succeeds before bundling. ``` and prior to that I got another error that seemed to indicate that my Ruby version is somehow out of sync: ``` C:\Sites\cmply>bundle update rake Updating git://github.com/twitter/twitter-text-rb.git Fetching source index for http://rubygems.org/ Bundler could not find compatible versions for gem "activesupport": In snapshot (Gemfile.lock): activesupport (3.2.3) In Gemfile: rails (= 3.1.3) x86-mingw32 depends on activesupport (= 3.1.3) x86-mingw32 Running `bundle update` will rebuild your snapshot from scratch, using only the gems in your Gemfile, which may resolve the conflict. ``` So is it all rooted in me having an incompatible ruby version? How should this be solved? Thanks!