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@@ -23,6 +23,54 @@ rescue LoadError => e
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   end
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 end
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+namespace :dep do
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+
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+  desc "check if all the dependencies specified in the configuration"
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+  task :check do
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+
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+    gems = Gem::SourceIndex.from_installed_gems.to_a.to_s
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+    missing = Array.new
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+
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+    Waves.config.dependencies.each do |dep|
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+      missing << dep unless gems.include? dep
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+    end
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+
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+    puts "You are missing the following expected dependencies:"
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+    missing.each { |x| puts "\t#{x}" }
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+    puts "(do a 'rake dep:install' to get 'em)"
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+
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+  end
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+  
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+  desc "install any missing dependencies specified in the configuration"
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+  task :install do
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+
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+    gems = Gem::SourceIndex.from_installed_gems.to_a.to_s
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+    missing = Array.new
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+
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+    Waves.config.dependencies.each do |dep|
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+      missing << dep unless gems.include? dep
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+    end
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+
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+    missing.each do |dep|
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+      puts "Installing dependency: #{dep}"
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+      begin
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+        require 'rubygems/dependency_installer'
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+        if Gem::RubyGemsVersion =~ /^1\.0\./
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+          Gem::DependencyInstaller.new(dep).install
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+        else
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+          # as of 1.1.0
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+          Gem::DependencyInstaller.new.install(dep)
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+        end
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+      rescue LoadError # < rubygems 1.0.1
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+        require 'rubygems/remote_installer'
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+        Gem::RemoteInstaller.new.install(dep)
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+      end
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+    end
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+    
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+  end
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+
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+end
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+
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 namespace :waves do
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   desc "freeze src=<wherever> to ./waves"