anchor.diff:    debClosureGenerator =
       {name, packagesLists, urlPrefix, packages}:
   
  -    runCommand "${name}.nix" { buildInputs = [ perl dpkg ]; } ''
  +    runCommand "${name}.nix"
  +      { nativeBuildInputs = [ buildPackages.perl buildPackages.dpkg ]; } ''
         for i in ${toString packagesLists}; do
           echo "adding $i..."
           case $i in
  
positive.code:   hd = "vda"; # either "sda" or "vda"
  
    initrdUtils = runCommand "initrd-utils"
      { buildInputs = [ nukeReferences ];
        allowedReferences = [ "out" modulesClosure ]; # prevent accidents like glibc being included in the initrd
      }
      ''
  
negative.code: 
  rec {
  
    qemu = buildPackages.qemu_kvm;
  
    modulesClosure = makeModulesClosure {
      inherit kernel rootModules;
  