Worked on the nix-community/emacs-overlay repository to enhance the reliability of Emacs builds on macOS by addressing a persistent issue with locating the libSystem library during native compilation. Applied a targeted fix to the build system, adding the SDK root to the linker’s search path, which resolved build warnings and aligned the overlay with recent improvements in Nixpkgs. Focused on system configuration and build systems using the Nix language, the work improved reproducibility and stability for users compiling Emacs from source in Nix-based environments. Maintained clear, traceable commit messages to support ongoing maintenance and collaboration within the project.