Latest Release (4.0.3): Binary distributions: Windows x64 Installer: Windows x64 ZIP Windows i386 Installer: Windows i386 ZIP Windows ARM64 Installer: Windows ARM64 ZIP macOS 10.13 or later macOS 10.10 or later Linux x86_64 Linux aarch64 SunOS sparc64 SunOS x86_64 Is that all? Where is FreeBSD binaries? Where is NetBSD binaries? Where is non-x86 and non-ARM binraies for Linux? What about legacy systems works on factories (Windows 2000, OS/2 (ArcaOS))? The FreeBSD is very popular server OS. Legacy systems will continue work. If you ignore them, they ignore you. (How do you think what is chipper: halt a rolling mill or keep use legacy system with Windows NT 4.0, Windows 2000, OS/2, Novell NetWare, etc?) Removing C++03 compatability from many libraries and breaking Boost.ASIO in 1.87 seriously damaged the Boost reputation. If Boost break building via b2 (non-CMake), Boost will damage reputation again. -- wbr, Leonid