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XML Builder 3.0.0破坏了Ruby“ gem generate”索引器。 怎么修?

[英]Ruby “gem generate” indexer broken with XML Builder 3.0.0. How to fix?

Problem: gem generate fails because it's missing XML Builder. 问题:gem生成失败,因为缺少XML Builder。

$ gem generate
  ERROR:  While executing gem ... (RuntimeError)
    Gem::Indexer requires that the XML Builder library be installed:
      gem install builder

How to fix this? 如何解决这个问题?

I found a solution: edit rubygem source code file indexer.rb to require the older Builder. 我找到了一个解决方案:编辑rubygem源代码文件indexer.rb以要求使用较旧的Builder。

gem 'builder', '~> 2.1'
require 'builder/xchar'

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