libboost-exception-dev 1.71.0.0ubuntu1 (i386 binary) in ubuntu focal

 This package forms part of the Boost C++ Libraries collection.
 .
 The purpose of Boost Exception is to ease the design of exception
 class hierarchies and to help write exception handling and error
 reporting code.
 .
 This package is a dependency package, which depends on Debian's default
 Boost version (currently 1.71).