anchor.diff:        diskImage=$(pwd)/disk-image.qcow2
         origImage=${attrs.diskImage}
         if test -d "$origImage"; then origImage="$origImage/disk-image.qcow2"; fi
  -      ${kvm}/bin/qemu-img create -b "$origImage" -f qcow2 $diskImage
  +      ${qemu}/bin/qemu-img create -b "$origImage" -f qcow2 $diskImage
       '';
   
       /* Inside the VM, run the stdenv setup script normally, but at the
  
positive.code:   createEmptyImage = {size, fullName}: ''
      mkdir $out
      diskImage=$out/disk-image.qcow2
      ${kvm}/bin/qemu-img create -f qcow2 $diskImage "${toString size}M"
  
      mkdir $out/nix-support
      echo "${fullName}" > $out/nix-support/full-name
  
negative.code: 
  rec {
  
    qemu = pkgs.qemu_kvm;
  
    qemuProg = "${qemu}/bin/qemu-kvm";
  
  
    modulesClosure = makeModulesClosure {
  