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[[!comment format=mdwn
 username="spwhitton"
 subject="comment 8"
 date="2015-12-02T21:44:37Z"
 content="""
My original goal was to have `Apt.buildDep` return NoChange if the build deps are already installed.  As a welcome but unexplained side-effect, on my system `noChangeIfUnchanged` *does* cause apt's output not to be displayed.

I'll think about ways to combine our two combinators.
"""]]