From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dave Love <fx@gnu.org>
Subject: fixing --check saying outputs not valid
Date: Fri, 08 Sep 2017 10:34:33 +0100
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I ran build --check on a new package and it complained that some output
of the derivation aren't valid.  Then I checked hwloc, which also has a
"lib" output and it has the same problem:

  guix build: error: build failed: some outputs of `/gnu/store/bsafscmmaw43ssb0lhnri3vdi0wi0chx-hwloc-1.11.7.drv' are not valid, so checking is not possible

With --verbosity=4, it looks as if that's due to

  |   |   path `/gnu/store/fsch2h9r8jp3c5ahs0b0mr8pr4yp4l3q-hwloc-1.11.7-lib' is required, but there is no substituter that can build it

How could I fix that?