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