During December 2024, asf@boinkor.net focused on stabilizing Darwin (macOS) Emacs builds in the nix-community/emacs-overlay repository. They addressed a persistent build warning by implementing a fix that ensures Emacs can reliably locate the libSystem library during native compilation. This solution involved modifying build system configuration to add the SDK root to the linker’s search path, aligning the overlay with recent changes in Nixpkgs. Working primarily with Nix and leveraging expertise in build systems and system configuration, asf@boinkor.net improved build reliability and reproducibility for users compiling Emacs from source in Nix-based macOS environments, demonstrating careful attention to compatibility.