During October 2024, Mueller focused on stabilizing the build system for the antmicro/verilator repository, addressing a persistent issue with GCC and Spack integration. He updated the Makefile, ensuring correct generation of precompiled header files by adding the -c flag, which resolved sporadic build failures when using the Spack wrapper. Working primarily with Makefile and C++, Mueller’s targeted bug fix improved build reproducibility and reliability across diverse environments. Although the scope was limited to a single bug fix, the work demonstrated a solid understanding of build systems and contributed to a smoother developer experience and more consistent CI feedback for downstream users.