During September 2025, Bastien Durel focused on enhancing the build system configuration for the apache/avro repository, specifically targeting Avro C++. He addressed AVRO-4181 by introducing conditional guards in the CMake install configuration, ensuring that static and shared library aliases are only defined when their respective build options are enabled. This approach reduced build-time errors and improved reliability for both users and continuous integration pipelines, especially in projects with optional components. Bastien utilized CMake scripting and cross-platform build configuration skills to deliver a more maintainable and robust build process, ultimately simplifying integration for downstream projects relying on Avro C++.