ObjFW packages are available for various operating systems and can be installed as following:

Operating System | Command
-|-
Alpine Linux | `doas apk add objfw`
CRUX | `sudo prt-get depinst objfw`
Debian | `sudo apt install objfw`
Fedora | `sudo dnf install objfw`
FreeBSD | `sudo pkg install objfw`
Haiku | `pkgman install objfw`
Haiku (gcc2h) | `pkgman install objfw_x86`
macOS (Homebrew) | `brew install objfw`
macOS (pkgsrc) | `cd && make install`
NetBSD | `cd && make install`
OpenBSD | `doas pkg_add objfw`
OpenIndiana | `sudo pkg install developer/objfw`
Ubuntu | `sudo apt install objfw`
Windows (MSYS2/CLANG64) | `pacman -S mingw-w64-clang-x86_64-objfw`
Windows (MSYS2/CLANGARM64) | `pacman -S mingw-w64-clang-aarch64-objfw`
Windows (MSYS2/UCRT64) | `pacman -S mingw-w64-ucrt-x86_64-objfw`
Windows (MSYS2/MINGW32) | `pacman -S mingw-w64-i686-objfw`

If your operating system is not listed, you can [build ObjFW from source](Building from source).