/usr/include/ruby-2.1.0/ruby/backward/ is in ruby2.1-dev 2.1.5-2+deb8u3.
This file is owned by root:root, with mode 0o755.
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    /usr/include/ruby-2.1.0/ruby/backward/classext.h
    
        
    
 | text/plain | root:root | 0o644 | 525 bytes | 
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    /usr/include/ruby-2.1.0/ruby/backward/rubyio.h
    
        
    
 | text/x-c | root:root | 0o644 | 215 bytes | 
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    /usr/include/ruby-2.1.0/ruby/backward/rubysig.h
    
        
    
 | text/x-c | root:root | 0o644 | 1.3 KB | 
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    /usr/include/ruby-2.1.0/ruby/backward/st.h
    
        
    
 | text/x-c | root:root | 0o644 | 217 bytes | 
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    /usr/include/ruby-2.1.0/ruby/backward/util.h
    
        
    
 | text/x-c | root:root | 0o644 | 227 bytes |