Worked on the mixxxdj/mixxx repository to enhance build stability for configurations where the STEM feature is disabled. Addressed a specific build issue by suppressing unused-parameter warnings within conditional compilation blocks, ensuring that builds with the -DSTEM=OFF flag complete cleanly and without warnings. This adjustment improved reliability for users opting out of STEM, reduced continuous integration noise, and maintained cross-platform compatibility. The work involved C++ development, build system configuration, and the use of C/C++ conditional compilation techniques. By focusing on warning suppression and feature-flag-driven build adjustments, the changes supported smoother upgrade paths and reduced future maintenance overhead.