Omnibus (embedded) fails the 'users' cookbook's need for ruby-shadow

gem_package "ruby-shadow"

ruby_block "require shadow library" do
  block do
    Gem.clear_paths  # <-- Necessary to ensure that the new library is found
    require 'shadow' # <-- gem is 'ruby-shadow', but library is 'shadow'
  end
end

user "scooby" do
  password "Checksum for hashed password is really long"
  # other parameters for the user
end

# Install the ruby-shadow package for the correct system

# First, see if this is an embedded install
ruby_location = RbConfig::CONFIG['prefix']

if ruby_location.eql? "/opt/opscode/embedded"
  log "Ruby location is #{ruby_location}, therefore I should use a local gem install instead"
  # Install
  gem_package "ruby-shadow"

  ruby_block "require shadow library" do
    block do
      Gem.clear_paths  # <-- Necessary to ensure that the new library is found
      require 'shadow' # <-- gem is 'ruby-shadow', but library is 'shadow'
    end
  end
  
else
  package "shadow_pkg" do
    package_name node[:shadow][:package]
    action :install
  end
end

[Tue, 31 Jan 2012 15:33:43 -0500] INFO: Processing gem_package[ruby-shadow] action install (users::default line 9)
[Tue, 31 Jan 2012 15:33:44 -0500] ERROR: gem_package[ruby-shadow] (users::default line 9) has had an error
[Tue, 31 Jan 2012 15:33:44 -0500] ERROR: gem_package[ruby-shadow] (/var/chef/cache/cookbooks/users/recipes/default.rb:9:in `from_file') had an error:
gem_package[ruby-shadow] (users::default line 9) had an error: Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

/opt/opscode/embedded/bin/ruby extconf.rb
checking for getspent() in -lshadow... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

Provided configuration options:
	--with-opt-dir
	--with-opt-include
	--without-opt-include=${opt-dir}/include
	--with-opt-lib
	--without-opt-lib=${opt-dir}/lib
	--with-make-prog
	--without-make-prog
	--srcdir=.
	--curdir
	--ruby=/opt/opscode/embedded/bin/ruby
	--with-shadowlib
	--without-shadowlib
/opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:368:in `try_do': The complier failed to generate an executable file. (RuntimeError)
You have to install development tools first.
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:435:in `try_link0'
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:440:in `try_link'
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:552:in `try_func'
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:748:in `block in have_library'
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:693:in `block in checking_for'
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:280:in `block (2 levels) in postpone'
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:254:in `open'
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:280:in `block in postpone'
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:254:in `open'
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:276:in `postpone'
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:692:in `checking_for'
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:743:in `have_library'
	from extconf.rb:13:in `<main>'


Gem files will remain installed in /opt/opscode/embedded/lib/ruby/gems/1.9.1/gems/ruby-shadow-2.1.2 for inspection.
Results logged to /opt/opscode/embedded/lib/ruby/gems/1.9.1/gems/ruby-shadow-2.1.2/gem_make.out

/opt/opscode/embedded/bin/ruby extconf.rb
checking for getspent() in -lshadow... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

Provided configuration options:
	--with-opt-dir
	--with-opt-include
	--without-opt-include=${opt-dir}/include
	--with-opt-lib
	--without-opt-lib=${opt-dir}/lib
	--with-make-prog
	--without-make-prog
	--srcdir=.
	--curdir
	--ruby=/opt/opscode/embedded/bin/ruby
	--with-shadowlib
	--without-shadowlib
/opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:368:in `try_do': The complier failed to generate an executable file. (RuntimeError)
You have to install development tools first.
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:435:in `try_link0'
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:440:in `try_link'
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:552:in `try_func'
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:748:in `block in have_library'
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:693:in `block in checking_for'
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:280:in `block (2 levels) in postpone'
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:254:in `open'
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:280:in `block in postpone'
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:254:in `open'
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:276:in `postpone'
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:692:in `checking_for'
	from /opt/opscode/embedded/lib/ruby/1.9.1/mkmf.rb:743:in `have_library'
	from extconf.rb:13:in `<main>'