Despite running 'make show-go-modules' and including the result,
the build starts with:

===> Building for kubo-0.13.1
go: downloading bazil.org/fuse v0.0.0-20200117225306-7b5117fecadc
go: downloading contrib.go.opencensus.io/exporter/prometheus v0.4.0
go: downloading github.com/AndreasBriese/bbloom v0.0.0-20190825152654-46b345b51c96
...
