Ruby on rails Ruby-无法加载文件（加载错误）

我安装了ruby aaws gem，并尝试运行一个示例脚本。我得到以下错误。我有什么遗漏吗？谢谢

1. gem install ruby-aaws

2. amazon.rb

require 'amazon/aws'
require 'amazon/aws/search'

include Amazon::AWS
include Amazon::AWS::Search

ASSOCIATES_ID = "************"
KEY_ID = '**************'

il = ItemLookup.new( 'ASIN', { 'ItemId' => 'B001COU9I6',
'MerchantId' => 'Amazon' })

rg = ResponseGroup.new( 'Medium' )

req = Request.new(KEY_ID, ASSOCIATES_ID)

resp = req.search( il, rg)
item_sets = resp.item_lookup_response[0].items
item_sets.each do |item_set|
item_set.item.each do |item|
attribs = item.item_attributes[0]
puts attribs
end
end

（错误）

$ruby amazon.rb

/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/Ruby/2.0.0/rubygems/core\u ext/kernel\u require.rb:55:in

require'：无法加载此类文件--iconv（加载错误）
from/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/Ruby/2.0.0/rubygems/core\u ext/kernel\u require.rb:55:in

require' from/Library/Ruby/Gems/2.0.0/Gems/Ruby-aaws-0.8.1/lib/amazon/aws.rb:12:in

'
from/Library/Ruby/Gems/2.0.0/Gems/Ruby-aaws-0.8.1/lib/amazon/aws.rb:7:in

' from/Library/Ruby/Gems/2.0.0/Gems/Ruby-aaws-0.8.1/lib/amazon/aws.rb:5:in

'
from/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/Ruby/2.0.0/rubygems/core\u ext/kernel\u require.rb:135:in

require' from/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/Ruby/2.0.0/rubygems/core\u ext/kernel\u require.rb:135:in

rescue in require'
from/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/Ruby/2.0.0/rubygems/core\u ext/kernel\u require.rb:144:in

require' 来自amazon.rb:7:in`'

---

您的系统中缺少

iconv

，或者您的版本与其他软件包的要求不匹配

检查是否已安装

iconv

或

安装

iconv

gem 或

如果没有任何效果，请尝试旧版本/其他版本

---

您的系统中缺少

iconv

，或者您的版本与其他软件包的要求不匹配

检查是否已安装

iconv

或

安装

iconv

gem 或

如果没有任何效果，请尝试旧版本/其他版本

iconv --version

which iconv

gem install iconv

rvm pkg install iconv

gem install iconv -v '~> 1.0.3'