anchor.diff:      owner = "libarchive";
       repo = "libarchive";
       inherit rev;
  -    sha256 = "ebe4cf59c1a6bb757d31452af4893fecc4e9d000c5914316f6b2932105fcdec8";
  +    sha256 = "15e4e46ae1e8da16fe13dfa69185ccc4126aa431885aa6a52fb39ab2f8b0017b";
     };
   
     nativeBuildInputs = [
  
positive.code: 
    buildInputs = [
      acl
      attr
      bzip2
      e2fsprogs
      libxml2
  
negative.code: }:
  
  let
    rev = "3649ed23c6b4392d692580c03b10a611e3eaaa32";
    date = "2018-06-17";
  in
  stdenv.mkDerivation rec {
    name = "libarchive-${date}";
  