Atsushi contributed to the google/oboe repository by implementing a build-time configurability feature focused on OpenSLES constant definitions. Using CMake for build system configuration, Atsushi introduced the OBOE_DO_NOT_DEFINE_OPENSL_ES_CONSTANTS option in the main CMakeLists.txt, allowing developers to disable automatic definition of OpenSLES constants via a conditional preprocessor macro. This approach enables safer builds and facilitates platform-specific customization, addressing potential conflicts in downstream integrations. The work demonstrated a solid understanding of CMake and build system design, delivering a targeted solution that enhances flexibility for users integrating OpenSL ES. The contribution was focused, technically sound, and well-aligned with project needs.