Worked on the apache/teaclave-trustzone-sdk repository to improve build reliability by addressing error handling related to environment variables. Focused on build system management and system programming using Rust, the developer implemented validation checks that detect missing environment variables during the build process. When required paths are not set, the build now provides clear, actionable error messages, guiding developers directly within the build output. This targeted fix reduces onboarding friction and accelerates triage by surfacing precise guidance at the point of failure. The work demonstrates a methodical approach to enhancing developer experience and maintaining robust build tooling through improved diagnostics.