diff --git a/.gitignore b/.gitignore
index 3e7b421..f348116 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@
 /dist/
 /doc/
 /pkg/
+/test/
diff --git a/Gemfile b/Gemfile
index e518563..de6a56d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,8 @@
 source 'https://rubygems.org'
 
-# Specify your gem's dependencies in rscons.gemspec
-gemspec
+gem "json"
+gem "rspec"
+gem "rake"
+gem "simplecov"
+gem "yard"
+gem "rdoc"
diff --git a/Gemfile.lock b/Gemfile.lock
index ecc8401..07467ef 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,9 +1,3 @@
-PATH
-  remote: .
-  specs:
-    rscons (1.16.0)
-      json (>= 1.8, < 3.0)
-
 GEM
   remote: https://rubygems.org/
   specs:
@@ -37,9 +31,9 @@ PLATFORMS
   x86-mingw32
 
 DEPENDENCIES
+  json
   rake
   rdoc
-  rscons!
   rspec
   simplecov
   yard
diff --git a/README.md b/README.md
index 2179505..3262f0e 100644
--- a/README.md
+++ b/README.md
@@ -1,13 +1,13 @@
 # Rscons
 
 Rscons (https://github.com/holtrop/rscons) is a software construction framework
-inspired by SCons and implemented in Ruby.
-
-[![Gem Version](https://badge.fury.io/rb/rscons.png)](http://badge.fury.io/rb/rscons)
+inspired by SCons and waf but implemented in Ruby.
 
 ## Installation
 
-    $ gem install rscons
+Rscons is distributed as a standalone Ruby script named ``rscons``. This file
+(containing the complete rscons build system) can be checked into your project
+and versioned along with your project.
 
 ## Usage
 
diff --git a/Rakefile.rb b/Rakefile.rb
index 517313c..393d796 100644
--- a/Rakefile.rb
+++ b/Rakefile.rb
@@ -5,25 +5,29 @@ rescue Bundler::BundlerError => e
   raise LoadError.new("Unable to setup Bundler; you might need to `bundle install`: #{e.message}")
 end
 
-require "bundler/gem_tasks"
 require "rspec/core/rake_task"
 require "yard"
 require "rake/clean"
+require "fileutils"
 
-CLEAN.include %w[build_test_run .yardoc doc coverage]
-CLOBBER.include %w[pkg]
+CLEAN.include %w[build_test_run .yardoc doc coverage test]
+CLOBBER.include %w[dist pkg]
 
 task :build_dist do
   sh "ruby build_dist.rb"
 end
 
 RSpec::Core::RakeTask.new(:spec, :example_string) do |task, args|
+  FileUtils.mkdir_p("test")
+  FileUtils.cp("dist/rscons", "test/rscons.rb")
   if args.example_string
     ENV["partial_specs"] = "1"
     task.rspec_opts = %W[-e "#{args.example_string}" -f documentation]
   end
 end
 
+task :spec => :build_dist
+
 YARD::Rake::YardocTask.new do |yard|
   yard.files = ['lib/**/*.rb']
 end
diff --git a/bin/rscons b/bin/rscons
index 3808f47..d915827 100755
--- a/bin/rscons
+++ b/bin/rscons
@@ -2,4 +2,6 @@
 
 require "rscons/cli"
 
-Rscons::Cli.run(ARGV)
+if __FILE__ == $0
+  Rscons::Cli.run(ARGV)
+end
diff --git a/lib/rscons/version.rb b/lib/rscons/version.rb
index 2cf2307..1a85526 100644
--- a/lib/rscons/version.rb
+++ b/lib/rscons/version.rb
@@ -1,4 +1,4 @@
 module Rscons
-  # gem version
+  # Project version.
   VERSION = "1.16.0"
 end
diff --git a/rscons.gemspec b/rscons.gemspec
deleted file mode 100644
index c150c65..0000000
--- a/rscons.gemspec
+++ /dev/null
@@ -1,28 +0,0 @@
-# -*- encoding: utf-8 -*-
-lib = File.expand_path("../lib", __FILE__)
-$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
-require "rscons/version"
-
-Gem::Specification.new do |gem|
-  gem.name          = "rscons"
-  gem.version       = Rscons::VERSION
-  gem.authors       = ["Josh Holtrop"]
-  gem.email         = ["jholtrop@gmail.com"]
-  gem.description   = %q{Software construction library inspired by SCons and implemented in Ruby.}
-  gem.summary       = %q{Software construction library inspired by SCons and implemented in Ruby}
-  gem.homepage      = "https://github.com/holtrop/rscons"
-  gem.license       = "MIT"
-
-  gem.files         = Dir["{bin,assets,lib}/**/*", "*.gemspec", "LICENSE.txt"]
-  gem.executables   = gem.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
-  gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
-  gem.require_paths = ["lib"]
-
-  gem.add_dependency "json", ">= 1.8", "< 3.0"
-
-  gem.add_development_dependency "rspec"
-  gem.add_development_dependency "rake"
-  gem.add_development_dependency "simplecov"
-  gem.add_development_dependency "yard"
-  gem.add_development_dependency "rdoc"
-end
diff --git a/spec/build_tests_spec.rb b/spec/build_tests_spec.rb
index f2f6489..4cd7ae4 100644
--- a/spec/build_tests_spec.rb
+++ b/spec/build_tests_spec.rb
@@ -62,7 +62,7 @@ describe Rscons do
         []
       end
     rscons_args = options[:rscons_args] || []
-    command = %W[ruby -I. -r _simplecov_setup #{@owd}/bin/rscons] + rsconsfile_args + rscons_args
+    command = %W[ruby -I. -r _simplecov_setup #{@owd}/test/rscons.rb] + rsconsfile_args + rscons_args
     @statics[:build_test_id] ||= 0
     @statics[:build_test_id] += 1
     command_prefix =
@@ -74,6 +74,8 @@ describe Rscons do
     command_name = "#{command_prefix}#{@statics[:build_test_id]}"
     File.open("_simplecov_setup.rb", "w") do |fh|
       fh.puts <<EOF
+require "bundler"
+Bundler.setup
 require "simplecov"
 class MyFormatter
   def format(*args)
@@ -88,7 +90,6 @@ SimpleCov.start do
   end
   formatter(MyFormatter)
 end
-$LOAD_PATH.unshift(#{@owd.inspect} + "/lib")
 # force color off
 ENV["TERM"] = nil
 #{options[:ruby_setup_code]}
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index f4f7e27..60990ba 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -12,4 +12,4 @@ SimpleCov.start do
   merge_timeout 3600
 end
 
-require "rscons"
+require_relative "../test/rscons"