Normally the built environment means the software part - files on the disk which are part of the build process. Your hardware, network, time, location, language

Normally the built environment means the software part - files on the disk which are part of the build process. Your hardware, network, time, location, language, etc. shouldn't influence the output. There's an explanation at https://reproducible-builds.org/docs/definition/ https://reproducible-builds.org/docs/definition/ which is a bit vague, but I haven't heard anyone seriously disputing that one in good faith. People doing the work know what this means.