anchor.diff:      "--enable-sql-pooling"
       "--enable-scsi-crypto"
     ] ++ optionals (readline != null) [ "--disable-conio" "--enable-readline" "--with-readline=${readline.dev}" ]
  -    ++ optional (python != null) "--with-python=${python}"
  +    ++ optional (python2 != null) "--with-python=${python2}"
       ++ optional (openssl != null) "--with-openssl=${openssl.dev}"
       ++ optional (sqlite != null) "--with-sqlite3=${sqlite.dev}"
       ++ optional (postgresql != null) "--with-postgresql=${postgresql}"
  
positive.code: 
    nativeBuildInputs = [ pkgconfig ];
    buildInputs = [
      nettools gettext readline openssl python flex ncurses sqlite postgresql
      libmysql zlib lzo jansson acl glusterfs libceph libcap rocksdb
    ];
  
  
negative.code: { stdenv, fetchFromGitHub, pkgconfig, nettools, gettext, libtool, flex
  , readline ? null, openssl ? null, python2 ? null, ncurses ? null, rocksdb
  , sqlite ? null, postgresql ? null, libmysql ? null, zlib ? null, lzo ? null
  , jansson ? null, acl ? null, glusterfs ? null, libceph ? null, libcap ? null
  }:
  