Gemfile in instrumental_agent-0.8.3 vs Gemfile in instrumental_agent-0.9.0

@@ -1,3 +1,8 @@
 source :rubygems
 
 gemspec
+
+if RUBY_VERSION < "1.9"
+  # Built and installed via ext/mkrf_conf.rb
+  gem 'system_timer', '~> 1.2'
+end
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