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diff --git a/README.md b/README.md
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+# openbabel gem
+
+GEM for [OpenBabel](http://openbabel.sf.net), a chemical library by Noel O'Boyle and others.
+
+openbabel gem has been tested with ruby 1.9. It only compiles on POSIX systems and requires:
+
+  * cmake
+  * curl
+  * tar, sed, make (those should be present anyway)
+
+## Install
+gem install openbabel
+
+It downloads the sources, compiles the ruby bindings and installs them. Check out [http://cs.maunz.de](http://cs.maunz.de) for more information.
diff --git a/Rakefile b/Rakefile
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+require 'rake/testtask'
+
+Rake::TestTask.new do |t|
+  t.libs << 'test'
+end
+
+desc "Run tests"
+task :default => :test
diff --git a/ext/openbabel/Makefile b/ext/openbabel/Makefile
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+++ b/ext/openbabel/Makefile
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+.PHONY: openbabel.so
+openbabel.so:
+	chmod 755 openbabel.so
+
+.PHONY: install
+install:
+	mkdir -p ../../lib/openbabel
+	mv openbabel.so ../../lib/openbabel
diff --git a/ext/openbabel/extconf.rb b/ext/openbabel/extconf.rb
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+++ b/ext/openbabel/extconf.rb
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+require 'fileutils'
+require 'tmpdir'
+
+ob_num_ver="2.3.1"
+ob_ver="openbabel-"+ob_num_ver
+
+main_dir = Dir.mktmpdir
+ob_main_dir=main_dir+"/"+ob_ver
+ob_bindings_dir=ob_main_dir+"/scripts/ruby"
+
+begin
+  Dir.chdir main_dir do
+    FileUtils.rm_rf ob_main_dir
+    `curl -L -d use_mirror=netcologne "http://downloads.sourceforge.net/project/openbabel/openbabel/#{ob_num_ver}/openbabel-#{ob_num_ver}.tar.gz" | tar xz`
+  end
+  Dir.chdir ob_main_dir do
+    `cmake #{ob_main_dir}`
+  end
+  Dir.chdir ob_bindings_dir do
+    `sed -i 's/Init_OpenBabel/Init_openbabel/g' *cpp`
+    require './extconf.rb'
+    `make`
+  end
+  FileUtils.cp(ob_bindings_dir+"/openbabel.so", "./")
+ensure
+  FileUtils.remove_entry_secure main_dir
+end
diff --git a/lib/openbabel.rb b/lib/openbabel.rb
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+++ b/lib/openbabel.rb
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+require 'openbabel/openbabel'
diff --git a/openbabel-0.0.1.gem b/openbabel-0.0.1.gem
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+++ b/openbabel-0.0.1.gem
diff --git a/openbabel-2.3.1.gem b/openbabel-2.3.1.gem
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+++ b/openbabel-2.3.1.gem
diff --git a/openbabel.gemspec b/openbabel.gemspec
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+++ b/openbabel.gemspec
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+Gem::Specification.new do |s|
+  s.name               = "openbabel"
+  s.version            = "2.3.1"
+
+  s.authors = ["Andreas Maunz"]
+  s.date = %q{2012-04-03}
+  s.description = %q{OpenBabel as a GEM}
+  s.email = %q{andreas@maunz.de}
+  s.homepage = %q{http://cs.maunz.de}
+  s.require_paths = ["lib"]
+  s.rubygems_version = %q{1.6.2}
+  s.summary = %q{OpenBabel!}
+  s.test_files = ["test/test_openbabel.rb"]
+
+  s.files = ["Rakefile", "lib/openbabel.rb", "ext/openbabel/Makefile"]
+  s.extensions = ['ext/openbabel/extconf.rb']
+end
diff --git a/test/test_openbabel.rb b/test/test_openbabel.rb
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+++ b/test/test_openbabel.rb
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+require 'test/unit'
+require 'openbabel'
+include OpenBabel
+
+class OBTest < Test::Unit::TestCase
+  def test_obmol
+    # Code from http://goo.gl/9H1LZ
+
+    smi2mol = OBConversion.new
+    smi2mol.set_in_format("smi")
+
+    mol = OBMol.new
+    smi2mol.read_string(mol, 'CC(C)CCCC(C)C1CCC2C1(CCC3C2CC=C4C3(CCC(C4)O)C)C') # cholesterol, no chirality
+    mol.add_hydrogens
+
+    assert_equal(mol.num_atoms, 74)
+    assert_in_delta(mol.get_mol_wt, 386.65, 0.1)
+    assert_equal(mol.get_formula, "C27H46O")
+
+  end
+end