I have installed boost to work with Windows Microsoft Visual C++ Cygwin g++ Linux openSuSe I can compile and run test programs On all three versions. However I get the following error messages when trying To call one of the routines in https://www.boost.org/doc/libs/1_67_0/libs/sort/doc/html/sort/parallel.html Here is the cygwin message $ g++ ch3604.cxx ch3604.cxx: In function 'int main()': ch3604.cxx:155:3: error: 'parallel_stable_sort' was not declared in this scope parallel_stable_sort( x.begin() , x.end() ); Here is the Microsoft message C:\document\cpp\examples>cl /EHsc /I "C:\Program Files\boost\boost_1_67_0" -O2 /F 1000000000 ch3604.cxx Microsoft (R) C/C++ Optimizing Compiler Version 19.13.26129 for x64 Copyright (C) Microsoft Corporation. All rights reserved. ch3604.cxx I get a similar message on openSuSe linux. Here is the top part of the source file ##### #include <iostream> #include <algorithm> #include <array> #include <chrono> #include <random> #include <string> #include <boost/sort/sort.hpp> using namespace std; ##### Here is a section of the main program ##### parallel_stable_sort( x.begin() , x.end() ); heading = "Boost sort "; t = timer_01.elapsed(); print_time(heading, t); cout << x[0] << " " << x[nr-1] << endl; ##### I get similar messages when trying to use any of the serial Or parallel routines. The documentation says that I only need to include #include <boost/sort/sort.hpp> To make things available. Any thoughts? Ian Chivers