Boost 1.39 for the Win32 Classic Toolchain from April 05, 2022

The Boost libraries are a set of C++ libraries that significantly expand the language

using template metaprogramming. This version (1.39) is for the classic toolchain for Win32 only.

Use Boost 1.70 for the modern Win32 and Win64 Clang-enhanced platforms.

https://developer.team/delphi/32034-boost-139-for-the-win32-classic-toolchain-from-april-05-2022.html