During November 2025, Zhen-Neng Li focused on enhancing build stability and portability for ARM64 architectures in the llama.cpp and ggml repositories. He addressed critical issues in CPU flag detection, ensuring that compilation on Ubuntu 20.04 with both GCC 9 and GCC 12 correctly handled arm64-specific flags. By refining the CMake-based build system and aligning detection logic across both projects, he prevented failures related to extended instruction sets and improved cross-compilation reliability. His work leveraged expertise in CMake, CPU architecture, and cross-compilation, resulting in more portable and maintainable build pipelines that support broader deployment and reduce platform-specific errors.