Zachary Marshall developed a robust header discovery mechanism for the mg5amcnlo/mg5amcnlo repository, focusing on improving the reliability of locating external library headers during the build process. By introducing a second, more specific search path for include directories, he addressed common issues with header file resolution that previously led to build failures and required manual intervention. This enhancement, implemented in Python and leveraging his expertise in build systems and code integration, increased the maintainability and stability of the project’s build pipeline. Zachary’s work provided a targeted solution to dependency management, streamlining development workflows and reducing friction for other contributors.