It is currently buildable with:

autoreconf -i && ./configure host=x86_64-pc-msys && make -j

A few changes are added:

* nbdkit_peer_name is added back but will always error.

* __declspec(dllexport) is added to the headers for PE compatibility.

* -D_spawnv=spawnv is now removed.

  I think I didn't run ./configure properly last time.

Here is the list of features that are tested to compile.

Optional server features:

    bash-completion ........................ yes
    manual pages ........................... yes
    SELinux ................................ no
    TLS .................................... no

Optional plugins:

    curl ................................... no
    example4 ............................... yes
    ext2 ................................... no
    floppy ................................. no
    guestfs ................................ no
    gzip ................................... no
    iso .................................... no
    libvirt ................................ no
    nbd .................................... no
    ssh .................................... no
    tar .................................... yes
    vddk ................................... yes

Languages:

    lua .................................... no
    ocaml .................................. no
    perl ................................... yes
    python ................................. yes
    ruby ................................... no
    rust ................................... no
    tcl .................................... no

Optional filters:

    ext2 ................................... no
    xz ..................................... no