Sam contributed to the OpenTTD/OpenTTD repository by stabilizing its build system, focusing on cross-compiler reliability and optimization correctness. Addressing a long-standing GCC bug, Sam replaced the -fno-tree-vrp flag with -fno-strict-enums for both GCC and Clang, ensuring the compiler no longer made incorrect assumptions about enum ranges. This targeted fix, implemented using CMake and deep knowledge of compiler flags, reduced build-time anomalies and improved the consistency of continuous integration runs. Sam’s work enabled faster feature validation and enhanced developer productivity by making build-time optimizations more reliable, demonstrating a strong grasp of build system engineering and compiler behavior.