Worked on the AliceO2Group/AliceO2 repository to improve build system reliability by addressing CUDA header dependencies in C++ code. Focused on refining Definitions.h to conditionally include the CUDA runtime header only when CUDA is required, thereby preventing unnecessary dependencies in CPU-only builds. This approach reduced header conflicts and improved overall build stability, making the build process cleaner and more maintainable. Utilized expertise in build systems and C++ to streamline the compilation workflow, which in turn enhanced developer productivity by shortening rebuild times and simplifying maintenance. The work demonstrated careful attention to conditional compilation and long-term codebase maintainability.