February 2026: Implemented critical numpy header discovery fixes in Buck2 and Buck2 Prelude, ensuring builds reliably locate numpy headers (e.g., numpy/arrayobject.h) by exposing header files and adding raw include directories. These changes reduce build failures in environments with varied numpy/Python configurations and improve the developer and CI experience for C extensions and Python integrations.

April 2025: Build-system hygiene improvements across facebook/sapling and facebook/fboss were implemented to reduce configuration drift, simplify non-LTO build paths, and improve reliability and developer onboarding. Focused cleanup removed obsolete flags and non-functional configuration entries, delivering a cleaner and more maintainable codebase with clearer governance for future build configurations.