anchor.diff:       strongly connected components.  See deb/deb-closure.nix. */
   
     fillDiskWithDebs =
  -    { size ? 4096, debs, name, fullName, postInstall ? null, createRootFS ? defaultCreateRootFS }:
  +    { size ? 4096, debs, name, fullName, postInstall ? null, createRootFS ? defaultCreateRootFS
  +    , QEMU_OPTS ? "", memSize ? 512 }:
   
       runInLinuxVM (stdenv.mkDerivation {
  -      inherit name postInstall;
  +      inherit name postInstall QEMU_OPTS memSize;
   
         debs = (lib.intersperse "|" debs);
   
  
positive.code:       };
      in
        (fillDiskWithDebs {
          inherit name fullName size postInstall;
          debs = import expr {inherit fetchurl;};
        }) // {inherit expr;};
  
  
negative.code:   makeImageFromDebDist =
      { name, fullName, size ? 4096, urlPrefix
      , packagesList ? "", packagesLists ? [packagesList]
      , packages, extraPackages ? [], postInstall ? ""
      , QEMU_OPTS ? "", memSize ? 512 }:
  
      let
        expr = debClosureGenerator {
  