In February 2025, Michael Olbrich contributed to the systemd/systemd repository by addressing a build compatibility issue related to the CLONE_PIDFD flag. He implemented a targeted fix in C, adding the missing definition to missing_sched.h to ensure successful compilation on systems with older glibc and kernel versions. This work focused on improving build system robustness and kernel development practices, enabling systemd to build reliably across a wider range of environments. By resolving undeclared identifier errors, Michael reduced downstream maintenance and enhanced CI reliability, demonstrating depth in system programming and a strong understanding of cross-version portability challenges in open source infrastructure.