libboost-thread1.55.0 1.55.0+dfsg-1ubuntu3 (amd64 binary) in ubuntu vivid

 This package forms part of the Boost C++ Libraries collection.
 .
 Toolkit for writing C++ programs that execute as multiple,
 asynchronous, independent, threads-of-execution. Each thread has its
 own machine state including program instruction counter and
 registers.