Worked on modernizing the build system for the endless-sky/endless-sky repository, focusing on ensuring compatibility with CMake 4. Addressed a persistent build-script bug by updating vcpkg dependencies and removing outdated configuration options, which reduced both local and CI build failures. The technical approach centered on build automation and dependency management, leveraging CMake, JSON, and YAML to streamline the process. These changes improved cross-platform build reliability, enhanced CI stability, and made onboarding smoother for new contributors. The work demonstrated a methodical approach to maintaining build infrastructure, emphasizing maintainability and efficiency in the development workflow without introducing new features during the period.