Paul Ferrell e85a8cde37 Config prefer upstream (#21487) ... This allows for quickly configuring a spack install/env to use upstream packages by default. This is particularly important when upstreaming from a set of officially supported spack installs on a production cluster. By configuring such that package preferences match the upstream, you ensure maximal reuse of existing package installations.		2021-02-24 10:57:50 -08:00
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spack	Config prefer upstream (#21487)	2021-02-24 10:57:50 -08:00