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diff --git a/Rakefile b/Rakefile
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+SVGJS_VERSION = '0.1'
+
+DEFAULT_MODULES = %w[ svg ]
+
+KILO = 1024   # how many bytes in a "kilobyte"
+
+task :default => :dist
+
+# module-aware file task
+class BuildTask < Rake::FileTask
+  def modules
+    prerequisites.map {|f| File.basename(f, '.js') }
+  end
+
+  def remove_prerequisites to_remove
+    @prerequisites -= to_remove
+    return self
+  end
+
+  def needed?() super or modules_mismatch? end
+
+  def modules_mismatch?
+    previous_modules != modules
+  end
+
+  def previous_modules
+    first_line =~ / - ([\w,\s]+) - / && $1.split(/\W+/)
+  end
+
+  def first_line
+    File.open(name, 'r') {|f| f.gets }
+  end
+end
+
+BuildTask.define_task 'dist/svg.js' => DEFAULT_MODULES.map {|m| "src/#{ m }.js" } do |task|
+  mkdir_p 'dist', :verbose => false
+  File.open(task.name, 'w') do |svgjs|
+    svgjs.puts "/* svg.js %s - %s - svgjs.com/license */" %
+                [version_string, task.modules.join(' ')]
+
+    task.prerequisites.each do |src|
+      # bring in source files one by one, but without copyright info
+      copyright = true
+      File.open(src).each_line do |line|
+        copyright = false if copyright and line !~ %r{^(/|\s*$)}
+        svgjs.puts line unless copyright
+      end
+    end
+  end
+end
+
+file 'dist/svg.min.js' => 'dist/svg.js' do |task|
+  require 'rubygems'
+  begin require 'uglifier'
+  rescue LoadError; fail "Uglifier not available: #{$!}"
+  else
+    File.open(task.name, 'w') do |min|
+      min << Uglifier.new.compile(File.read(task.prerequisites.first))
+    end
+  end
+end
+
+file 'dist/svg.min.gz' => 'dist/svg.min.js' do |task|
+  verbose false do
+    tmp_file = task.name.sub('.gz', '')
+    cp task.prerequisites.first, tmp_file
+    sh 'gzip', '--best', tmp_file
+  end
+end
+
+desc "Concatenate source files to build svg.js"
+task :concat, [:modules] do |task, args|
+  modules = args[:modules].to_s.split(':')
+  to_add, to_exclude = modules.partition {|m| m.sub!(/^(-)?(.+)/, 'src/\2.js'); !$1 }
+
+  Rake::Task['dist/svg.js'].
+    remove_prerequisites(to_exclude).enhance(to_add).
+    invoke
+end
+
+desc "Generate svg.js distribution files and report size statistics"
+task :dist => ['dist/svg.js', 'dist/svg.min.js', 'dist/svg.min.gz'] do |task|
+  orig_size, min_size, gz_size = task.prerequisites.map {|f| File.size(f) }
+
+  puts "Original version: %.3fk" % (orig_size.to_f / KILO)
+  puts "Minified: %.3fk" % (min_size.to_f / KILO)
+  puts "Minified and gzipped: %.3fk, compression factor %.3f" % [gz_size.to_f / KILO, orig_size.to_f / gz_size]
+
+  rm_f 'dist/svg.min.gz', :verbose => false
+end
+
+desc "List available modules"
+task :modules do
+  Dir['src/**/*.js'].each do |file|
+    name = file.gsub(/^src\//,'').gsub(/.js$/,'')
+    puts name + (DEFAULT_MODULES.include?(name) ? '*' : '')
+  end
+  puts "\n*included in default build"
+end
+
+task(:clean) { rm_rf 'dist' }
+
+desc "Run tests with PhantomJS"
+task :test do
+  sh 'script/test'
+  Rake::Task[:check_whitespace].invoke
+end
+
+desc "Strip trailing whitespace and ensure each file ends with a newline"
+task :whitespace do
+  verbose false do
+    files = Dir['{src,test,examples}/**/*.{js,html}']
+    ruby(*%w'-p -i -e $_.sub!(/\s*\Z/,"\n")'.concat(files))
+  end
+end
+
+desc "Checks for trailing whitespace in source files and tests"
+task :check_whitespace do
+  flunked = false
+  flunk = lambda {|file, num| flunked = true; puts "#{file}:#{num}" }
+  Dir['{src,test,examples}/**/*.{js,html}'].each do |file|
+    File.open(file, 'r') {|f| f.each_with_index {|ln, num| flunk.call(file, num + 1) if ln.chomp =~ /\s+$/ } }
+  end
+  fail if flunked
+end
+
+# desc "Generate docco documentation from source files"
+# task :docco do
+#   verbose false do
+#     sh 'docco', *Dir['src/*.js']
+#   end
+# end
+
+# svg.js version number + git sha if available
+def version_string
+  desc = `git describe --tags HEAD 2>&1`.chomp
+  if $?.success?
+    desc
+  else
+    suffix, dir = '', File.basename(Dir.pwd)
+    # detect git sha from directory name of GitHub zip/tarball
+    suffix = "-g#{$1}" if dir =~ /^wout-svg.js-([a-f0-9]{7,40})$/
+    SVGJS_VERSION + suffix
+  end
+end
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