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These variables will always be imported from the environment, and never from previous builds. For SCons to actually use these values, they need to not only be in the environment variables external commands SCons runs sees, they also have to be promoted to actual SCons construction variables. Change-Id: I54035442d70972396f1788bd0773877222d7a7c5 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/56386 Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>