/usr/lib/ruby/1.9.1/rubygems/ext/ is in libruby1.9.1 1.9.3.484-2ubuntu1.
This file is owned by root:root, with mode 0o755.
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    /usr/lib/ruby/1.9.1/rubygems/ext/builder.rb
    
        
    
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                text/x-c++ | root:root | 0o644 | 1.4 KB | 
                    
    
        
    
    
    /usr/lib/ruby/1.9.1/rubygems/ext/configure_builder.rb
    
        
    
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                text/x-c++ | root:root | 0o644 | 549 bytes | 
                    
    
        
    
    
    /usr/lib/ruby/1.9.1/rubygems/ext/ext_conf_builder.rb
    
        
    
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                text/x-c++ | root:root | 0o644 | 522 bytes | 
                    
    
        
    
    
    /usr/lib/ruby/1.9.1/rubygems/ext/rake_builder.rb
    
        
    
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                text/x-c++ | root:root | 0o644 | 1.0 KB |