for i in block channel clock console device flow fs kv net protocols random stack time; do
  opam source mirage-$i --dev
done
git clone -b jbuilder git://github.com/avsm/mirage
jbuilder build @mirage/types/lwt/doc
jbuilder build mirage/types/lwt/mirage_types_lwt.cmx

$ cat jbuilder-workspace
(context ((switch 4.03.0)))
(context ((switch 4.04.1)))

OPAMSWITCH=4.03.0 opam install -y -j4 lwt cstruct ipaddr uri io-page
OPAMSWITCH=4.04.1 opam install -y -j4 lwt cstruct ipaddr uri io-page

$ jbuilder build mirage/types/lwt/mirage_types_lwt.cmx
<snip>
    ocamlopt mirage-channel/lwt/mirage_channel_lwt.{cmx,o} [4.04.1]
    ocamlopt mirage/types/mirage_types.{cmx,o} [4.04.1]
    ocamlopt mirage-block/lwt/mirage_block_iter.{cmx,o} [4.04.1]
    ocamlopt mirage-block/lwt/mirage_block_lwt.{cmx,o} [4.03.0]
    ocamlopt mirage-block/lwt/mirage_block_lwt.{cmx,o} [4.04.1]
    ocamlopt mirage/types/lwt/mirage_types_lwt.{cmx,o} [4.03.0]
    ocamlopt mirage/types/lwt/mirage_types_lwt.{cmx,o} [4.04.1]