ruby-pdf-core 0.5.1-1 (amd64 binary) in ubuntu yakkety

 PDF::Core is a pure Ruby library to render PDF documents. It supports
 several PDF features, such as among others:
  * low-level annotation
  * istream objects and stream filters
  * NameTree
  * object repository
  * object serialization
  * indirect objects
  * page geometries
 .
 It is used internally by Prawn (provided in the ruby-prawn package),
 a Ruby PDF generation library.