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?