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I made https://trac.sagemath.org/ticket/24919 several months ago to provide a more general system by which Sage can check for existing dependencies satisfied by the system, rather than needlessly building so many of its own. This is just a framework, so checks still need to be added for each individual package (with a priority / focus on common system libraries that shouldn't need to be built for Sage). But it would be nice if someone could give this a positive review, or at least suggest improvements that would get it a positive review. A few people have already tested it out but it hasn't gone anywhere.