During June 2025, Maciej Lemanczyk focused on improving the reliability of the build system for the tuist/tuist repository. He addressed a persistent issue where hardcoded Xcode include paths caused build failures across different Xcode and toolchain installations. By leveraging his expertise in Swift, build system configuration, and Xcode toolchain management, Maciej replaced these hardcoded paths with dynamic resolution using TOOLCHAIN_DIR. This change ensured that Swift Package Manager manifest API paths resolved correctly regardless of the environment, reducing environment-specific build errors. The work demonstrated a targeted, in-depth approach to cross-environment compatibility, though it was limited to a single bug fix.