anchor.diff:  
     postInstall = ''
       rm -rf $out/{lib,share}
  +    wrapProgram $out/bin/hsevm --add-flags '+RTS -N$((`${coreutils}/bin/nproc` - 1)) -RTS'
     '';
   
     extraLibraries = [
  -    aeson ansi-wl-pprint base base16-bytestring base64-bytestring
  -    binary brick bytestring containers cryptonite data-dword deepseq
  -    directory filepath ghci-pretty lens lens-aeson memory mtl
  -    optparse-generic process QuickCheck quickcheck-text readline
  -    rosezipper temporary text text-format unordered-containers vector
  -    vty
  +    abstract-par aeson ansi-wl-pprint base base16-bytestring
  +    base64-bytestring binary brick bytestring cereal containers
  +    cryptonite data-dword deepseq directory filepath ghci-pretty lens
  +    lens-aeson memory monad-par mtl optparse-generic process QuickCheck
  +    quickcheck-text readline rosezipper scientific temporary text text-format
  +    unordered-containers vector vty
     ];
     executableHaskellDepends = [
       readline zlib bzip2
  
positive.code:   maintainers = [stdenv.lib.maintainers.dbrock];
  }) (attrs: {
    buildInputs = attrs.buildInputs ++ [solc];
  })
  
negative.code: { mkDerivation, abstract-par, aeson, ansi-wl-pprint, base
  , base16-bytestring, base64-bytestring, binary, brick, bytestring
  , cereal, containers, cryptonite, data-dword, deepseq, directory
  , filepath, ghci-pretty, here, HUnit, lens, lens-aeson, memory
  , monad-par, mtl, optparse-generic, process, QuickCheck
  , quickcheck-text, readline, rosezipper, scientific, stdenv, tasty, tasty-hunit
  , tasty-quickcheck, temporary, text, text-format
  , unordered-containers, vector, vty
  , fetchFromGitHub, lib, makeWrapper
  , ncurses, zlib, bzip2, solc, coreutils
  }:
  
  lib.overrideDerivation (mkDerivation rec {
    pname = "hsevm";
    version = "0.6.4";
  
    src = fetchFromGitHub {
      owner = "dapphub";
      repo = "hsevm";
      rev = "v${version}";
      sha256 = "01b67k9cam4gvsi07q3vx527m1w6p6xll64k1nl27bc8ik6jh8l9";
    };
  
    isLibrary = false;
  