Worked on the rust-lang/libc repository to address a compatibility issue affecting Linux uClibc targets, specifically for the L4Re operating system. Delivered a targeted bug fix in Rust that restored previously removed constants, ensuring stable cross-OS behavior and preventing regressions unique to L4Re environments. The solution involved a narrowly scoped change that limited exclusions to the L4Re target, thereby maintaining compatibility for other operating systems using uClibc. This work improved the portability and reliability of the libc crate across diverse Linux configurations. Demonstrated skills in Rust, cross-platform development, and system programming while focusing on maintainable and precise code changes.