libboost-iostreams-dev 1.71.0.0ubuntu2 (i386 binary) in ubuntu focal

 This package forms part of the Boost C++ Libraries collection.
 .
 Boost.Iostreams are a collection of concepts and a set of templates
 which turn models of these concepts into C++ standard library streams
 and stream buffers.
 .
 This package is a dependency package, which depends on Debian's default
 Boost version (currently 1.71).