Bernd Machenschalk focused on improving build hygiene for the BOINC/boinc repository by refining the MinGW build process. He addressed a specific issue where the unnecessary str_replace.h header was being installed, which could lead to build noise and potential inclusion errors. By modifying the lib/Makefile.mingw configuration, Bernd ensured that this header was excluded from installation, resulting in a cleaner and more reliable build output. His work demonstrated attention to detail in build system configuration and effective use of Makefile scripting. Over the month, Bernd concentrated on targeted bug fixing rather than feature development, delivering a focused and maintainable solution.