Worked on improving cross-platform build stability for the protocolbuffers/protobuf repository by addressing a platform-specific build failure related to CLOCK_UPTIME_RAW usage. Applied macro-based conditional compilation techniques in C++ and C# to ensure CLOCK_UPTIME_RAW was only included when appropriate feature test macros were defined. This approach prevented undefined symbol errors across different build systems, reducing CI failures and stabilizing feature set descriptor generation. Focused on error handling and build system compatibility, collaborating with maintainers to align the build process across multiple environments. The work resulted in more reliable builds and fewer platform-related regressions, enhancing the overall maintainability of the codebase.