anchor.diff:    outputs = [ "out" "dev" "man" ];
   
     nativeBuildInputs = [ autoreconfHook pkg-config ];
  -  buildInputs = [ cpio zlib bzip2 file libarchive libgcrypt nspr nss db xz python lua sqlite ]
  +  buildInputs = [ cpio zlib zstd bzip2 file libarchive libgcrypt nspr nss db xz python lua sqlite ]
                   ++ lib.optionals stdenv.cc.isClang [ llvmPackages.openmp ];
   
     # rpm/rpmlib.h includes popt.h, and then the pkg-config file mentions these as linkage requirements
  
positive.code: { stdenv, lib, fetchpatch
  , pkg-config, autoreconfHook
  , fetchurl, cpio, zlib, bzip2, file, elfutils, libbfd, libgcrypt, libarchive, nspr, nss, popt, db, xz, python, lua, llvmPackages
  , sqlite
  }:
  
  stdenv.mkDerivation rec {
  
negative.code:     "--enable-python"
      "--enable-ndb"
      "--enable-sqlite"
      "--enable-zstd"
      "--localstatedir=/var"
      "--sharedstatedir=/com"
    ];
  