class Gem::Dependency

def encode_with(coder)
  to_yaml_properties.each do |ivar|
    coder[ivar.to_s.sub(/^@/, "")] = instance_variable_get(ivar)
  end
end

def force_ruby_platform
  return @force_ruby_platform if defined?(@force_ruby_platform) && !@force_ruby_platform.nil?
  @force_ruby_platform = default_force_ruby_platform
end

def to_lock
  out = String.new("  #{name}")
  unless requirement.none?
    reqs = requirement.requirements.map {|o, v| "#{o} #{v}" }.sort.reverse
    out << " (#{reqs.join(", ")})"
  end
  out
end

def to_yaml_properties
  instance_variables.reject {|p| ["@source", "@groups"].include?(p.to_s) }
end