Actually, only ignore guard-specific gems

.travis.yml

@@ -1,5 +1,5 @@
 language: ruby
-bundler_args: --without development
+bundler_args: --without guard
 script: 'bundle exec rake --trace 2>&1'
 rvm:
   - 1.8.7

Gemfile

@@ -5,19 +5,27 @@ gemspec
 gem 'rake'
 gem 'rdoc'
 
+group :guard do
   require 'rbconfig'
 
-group :development do
-  gem 'guard-test'
-
   if RbConfig::CONFIG['target_os'] =~ /darwin/i
-    gem 'rb-fsevent', '~> 0.4'
-    gem 'growl'
+    gem 'rb-fsevent', :require => false
+
+    if `uname`.strip == 'Darwin' && `sw_vers -productVersion`.strip >= '10.8'
+      gem 'terminal-notifier-guard', '~> 1.5.3', :require => false
+    else
+      gem 'growl', :require => false
+    end rescue Errno::ENOENT
+
+  elsif RbConfig::CONFIG['target_os'] =~ /linux/i
+    gem 'libnotify',  '~> 0.8.0', :require => false
+    gem 'rb-inotify', :require => false
+
+  elsif RbConfig::CONFIG['target_os'] =~ /mswin|mingw/i
+    gem 'win32console', :require => false
+    gem 'rb-notifu', '>= 0.0.4', :require => false
+    gem 'wdm', :require => false
   end
 
-  if RbConfig::CONFIG['target_os'] =~ /linux/i
-    gem 'rb-inotify', '~> 0.5.1'
-    gem 'libnotify',  '~> 0.1.3'
+  gem 'guard-test'
 end
-end
-