diff --git a/docs/Rakefile b/docs/Rakefile
index 0caaeca8..356f7111 100644
--- a/docs/Rakefile
+++ b/docs/Rakefile
@@ -64,6 +64,28 @@ task :build do
   Bonsai::Exporter.publish!
 end
 
+$BINARIES = {
+  :osx32 => "--host=i686-apple-darwin10 CFLAGS='-m32 -g -O'",
+  :osx64 => "--host=i686-apple-darwin10 CFLAGS='-m64 -g -O'",
+  :win32 => "--host=i686-w64-mingw32 CFLAGS='-g -O'",
+  :win64 => "--host=x86_64-w64-mingw32 CFLAGS='-g -O'",
+  :linux32 => "--host=x86_64-linux-gnu CFLAGS='-m32 -g -O'",
+  :linux64 => "--host=x86_64-linux-gnu CFLAGS='-m64 -g -O'"
+}
+
+$BINARIES.each do |name, args|
+  file "../build/#{name}" do |t|
+    sh "MAKEFLAGS=-j4 ../build/compile #{name} #{args}"
+  end
+  task :binaries => ["../build/#{name}"]
+end
+
+task :binaries => ["output/download"] do
+  $BINARIES.each do |name, args|
+    FileUtils.cp_r "../build/#{name}", "output/download/"
+  end
+end
+
 def load_manual
   YAML::ENGINE.yamler = 'syck'
   YAML::load(File.open("content/3.manual/manual.yml"))