During October 2025, Kdn worked on the NixOS/nixpkgs repository, focusing on build system management and package maintenance using Nix. Kdn implemented CMake 4 compatibility patches for the arrow-cpp and ceph packages, addressing emerging build issues as the toolchain evolved. By updating cpp_redis and related components, Kdn ensured that downstream users could upgrade to CMake 4 without disruption, maintaining build integrity across dependencies. The work required careful coordination of cross-repository patches and thorough documentation linked to issue 445447 for traceability. This contribution demonstrated depth in build systems and package management, with a focus on stability and maintainability.