Worked on enhancing build stability and cross-platform reliability for the facebook/zstd repository, focusing on the build system and CMake configuration. Addressed a portability issue with the -z noexecstack linker flag, ensuring it propagates correctly across different compilers, particularly on macOS. The solution involved modifying how linker flags are passed and adding verification logic to confirm correct application during builds. This work improved the reproducibility and reliability of builds in continuous integration environments on both macOS and Linux. Utilized skills in build systems, CMake, and cross-platform development, with an emphasis on robust engineering and careful validation rather than new feature delivery.