During June 2025, Kasper focused on improving the build system configuration for the ossrs/ffmpeg-webrtc repository, addressing a persistent issue with Clang-specific linker handling in the configure script. By analyzing how indirect linker calls were managed, Kasper implemented a solution in Shell that ensures linker flags are correctly propagated when Clang is used as the driver, adding the necessary '-Wl,' prefix for compatibility. This targeted bug fix enhanced cross-toolchain reliability and reduced build failures, directly benefiting both developer experience and CI stability. The work demonstrated a strong understanding of build systems and cross-platform toolchain challenges within open source environments.