diff --git a/Manifest.txt b/Manifest.txt
new file mode 100644
index 0000000..1ae7ab2
--- /dev/null
+++ b/Manifest.txt
@@ -0,0 +1,10 @@
+COPYING
+ChangeLog
+Manifest.txt
+README
+Rakefile
+ext/usb/constants.h
+ext/usb/extconf.rb
+ext/usb/usb.c
+lib/usb.rb
+sample/usb-power
diff --git a/README b/README
index 1fbafbe..41a817c 100644
--- a/README
+++ b/README
@@ -32,9 +32,17 @@ LGPL
 
 == Install
 
-  % ruby extconf.rb 
-  % make
-  % make install
+  % gem install usb
+
+== Packaging
+
+  % rake package
+
+== Releasing to rubygems.org
+
+Make sure to `gem install hoe-git` first.
+
+  % rake release VERSION=0.3.0
 
 == Reference Manual
 
diff --git a/Rakefile b/Rakefile
new file mode 100644
index 0000000..d9b27eb
--- /dev/null
+++ b/Rakefile
@@ -0,0 +1,29 @@
+# -*- ruby -*-
+
+require 'rubygems'
+require 'hoe'
+gem 'rake-compiler', '>= 0.4.1'
+require "rake/extensiontask"
+
+Hoe.plugin :git # gem install hoe-git
+
+Hoe.spec 'usb' do
+  developer 'Tanaka Akira', 'akr@fsij.org'
+
+  self.history_file      = 'ChangeLog'
+  self.readme_file       = 'README'
+  self.testlib           = :minitest
+
+  extra_dev_deps << ['rake-compiler', '>= 0.4.1']
+
+  self.spec_extras = {
+    :extensions  => ["ext/usb/extconf.rb"],
+    :homepage    => 'http://www.a-k-r.org/ruby-usb/'
+  }
+
+  Rake::ExtensionTask.new "usb", spec do |ext|
+    ext.lib_dir = File.join(*['lib', ENV['FAT_DIR']].compact)
+  end
+end
+
+task :test => :compile
diff --git a/constants.h b/ext/usb/constants.h
similarity index 100%
rename from constants.h
rename to ext/usb/constants.h
diff --git a/extconf.rb b/ext/usb/extconf.rb
similarity index 100%
rename from extconf.rb
rename to ext/usb/extconf.rb
diff --git a/ext/usb/mkmf.log b/ext/usb/mkmf.log
new file mode 100644
index 0000000..4337446
--- /dev/null
+++ b/ext/usb/mkmf.log
@@ -0,0 +1,46 @@
+have_library: checking for usb_init() in -lusb... -------------------- no
+
+"gcc -o conftest -I. -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin11.0 -I.  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -arch i386 -arch x86_64 -g -Os -pipe -fno-common -DENABLE_DTRACE  -fno-common  -pipe -fno-common   conftest.c  -L. -L/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib -L. -arch i386 -arch x86_64      -lruby -lusb  -lpthread -ldl  "
+conftest.c: In function ‘t’:
+conftest.c:3: error: ‘usb_init’ undeclared (first use in this function)
+conftest.c:3: error: (Each undeclared identifier is reported only once
+conftest.c:3: error: for each function it appears in.)
+conftest.c: In function ‘t’:
+conftest.c:3: error: ‘usb_init’ undeclared (first use in this function)
+conftest.c:3: error: (Each undeclared identifier is reported only once
+conftest.c:3: error: for each function it appears in.)
+lipo: can't figure out the architecture type of: /var/folders/yv/c2r06v597n5bdpw_bf8qcmb80000gp/T//ccoOdXex.out
+checked program was:
+/* begin */
+1: /*top*/
+2: int main() { return 0; }
+3: int t() { void ((*volatile p)()); p = (void ((*)()))usb_init; return 0; }
+/* end */
+
+"gcc -o conftest -I. -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin11.0 -I.  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -arch i386 -arch x86_64 -g -Os -pipe -fno-common -DENABLE_DTRACE  -fno-common  -pipe -fno-common   conftest.c  -L. -L/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib -L. -arch i386 -arch x86_64      -lruby -lusb  -lpthread -ldl  "
+ld: warning: ignoring file /usr/local/lib/libusb.dylib, file was built for unsupported file format which is not the architecture being linked (i386)
+Undefined symbols for architecture i386:
+  "_usb_init", referenced from:
+      _t in cc1jogpT.o
+ld: symbol(s) not found for architecture i386
+collect2: ld returned 1 exit status
+lipo: can't open input file: /var/folders/yv/c2r06v597n5bdpw_bf8qcmb80000gp/T//cck9xeTb.out (No such file or directory)
+checked program was:
+/* begin */
+1: /*top*/
+2: int main() { return 0; }
+3: int t() { usb_init(); return 0; }
+/* end */
+
+--------------------
+
+have_header: checking for ruby/st.h... -------------------- yes
+
+"gcc -E -I. -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin11.0 -I.  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE     -g -Os -pipe -fno-common -DENABLE_DTRACE  -fno-common  -pipe -fno-common    conftest.c -o conftest.i"
+checked program was:
+/* begin */
+1: #include <ruby/st.h>
+/* end */
+
+--------------------
+
diff --git a/usb.c b/ext/usb/usb.c
similarity index 100%
rename from usb.c
rename to ext/usb/usb.c
diff --git a/lib/usb.rb b/lib/usb.rb
index 1d8ae5f..9120f72 100644
--- a/lib/usb.rb
+++ b/lib/usb.rb
@@ -61,6 +61,8 @@
 #
 
 module USB
+  VERSION = '0.3.0'
+
   def USB.busses
     result = []
     bus = USB.first_bus