Merge over change to gemspec handling.

Gemfile

 source :rubygems
 
 gem 'rake', '>= 0.8.7', :require => false
-gem 'activesupport', '>= 2.3.0', :require => false
+gem 'activerecord', '>= 2.3.0', :require => false
 
 group :development do
-  gem 'mg'
-  platforms :ruby do
+  gem 'mg', :require => false
+  platforms :mri do
     gem 'yard', :require => false
   end
 end

Rakefile

@@ -22,8 +22,73 @@ end
 
 require "./lib/annotate"
 
-require 'mg'
-MG.new("annotate.gemspec")
+require "mg"
+begin
+  MG.new("annotate.gemspec")
+rescue Exception => e
+  STDERR.puts("WARNING: Couldn't read gemspec.  As such, a number of tasks may be unavailable to you until you run 'rake gem:gemspec' to correct the issue.")
+  # Gemspec is probably in a broken state, so let's give ourselves a chance to
+  # build a new one...
+end
+DEVELOPMENT_GROUPS=[:development, :test]
+RUNTIME_GROUPS=Bundler.definition.groups - DEVELOPMENT_GROUPS
+namespace :gem do
+  task :gemspec do
+    spec = Gem::Specification.new do |gem|
+      # See http://docs.rubygems.org/read/chapter/20
+      # for more options.
+      gem.version = Annotate.version
+      gem.name = "annotate"
+      gem.homepage = "http://github.com/ctran/annotate_models"
+      gem.rubyforge_project = "annotate"
+      gem.license = "Ruby"
+      gem.summary = %q{Annotates Rails Models, routes, fixtures, and others based on the database schema.}
+      gem.description = %q{Annotates Rails/ActiveRecord Models, routes, fixtures, and others based on the database schema.}
+      gem.email = ["alex@stinky.com", "ctran@pragmaquest.com", "x@nofxx.com", "turadg@aleahmad.net", "jon@cloudability.com"]
+      gem.authors = ["Cuong Tran", "Alex Chaffee", "Marcos Piccinini", "Turadg Aleahmad", "Jon Frisby"]
+      gem.require_paths = ["lib"]
+      # gem.rdoc_options = ["--charset=UTF-8"]
+      # gem.required_ruby_version = "> 1.9.2"
+
+      Bundler.load.dependencies_for(*RUNTIME_GROUPS).each do |dep|
+        runtime_resolved = Bundler.definition.specs_for(RUNTIME_GROUPS).select { |spec| spec.name == dep.name }.first
+        if(!runtime_resolved.nil?)
+          gem.add_dependency(dep.name, dep.requirement)
+        end
+      end
+
+      gem.executables = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
+      gem.extra_rdoc_files = ['README.rdoc', 'CHANGELOG.rdoc', 'TODO.rdoc']
+
+      gem.files = `git ls-files -- .`.split("\n").reject do |fn|
+        fn =~ /^Gemfile.*/ ||
+        fn =~ /^Rakefile/ ||
+        fn =~ /^\.rvmrc/ ||
+        fn =~ /^\.gitignore/ ||
+        fn =~ /^\.rspec/ ||
+        fn =~ /^\.document/ ||
+        fn =~ /^\.yardopts/ ||
+        fn =~ /^pkg/ ||
+        fn =~ /^spec/ ||
+        fn =~ /^doc/ ||
+        fn =~ /^vendor\/cache/
+      end.sort
+    end
+    File.open("annotate.gemspec", "wb") do |fh|
+      fh.write("# This file is auto-generated!\n")
+      fh.write("# DO NOT EDIT THIS FILE DIRECTLY!\n")
+      fh.write("# Instead, edit the Rakefile and run 'rake gems:gemspec'.")
+      fh.write(spec.to_ruby)
+    end
+  end
+end
+
+namespace :jeweler do
+  task :clobber do
+    FileUtils.rm_f("pkg")
+  end
+end
+task :clobber => :'jeweler:clobber'
 
 require "rspec/core/rake_task" # RSpec 2.0
 RSpec::Core::RakeTask.new(:spec) do |t|