anchor.diff:    };
   
     buildInputs = [ perl ]
  -                ++ lib.optionals withMySQL [ zlib libmysql ]
  +                ++ lib.optionals withMySQL [ zlib mysql57.connector-c ]
                   ++ lib.optional withPgSQL postgresql
                   ++ lib.optional withSQLite sqlite
                   ++ lib.optional withDB db;
  
positive.code: { stdenv, lib, fetchurl, makeWrapper
  , gawk, gnused, gnugrep, coreutils, which
  , perl, NetSMTP
  , withMySQL ? false, zlib, libmysql
  , withPgSQL ? false, postgresql
  , withSQLite ? false, sqlite
  , withDB ? false, db
  
negative.code:     "--enable-preferences-extension"
      "--enable-long-usernames"
      "--enable-external-lookup"
    ] ++ lib.optional withMySQL "--with-mysql-includes=${mysql57.connector-c}/include/mysql"
      ++ lib.optional withPgSQL "--with-pgsql-libraries=${postgresql.lib}/lib";
  
    # Lots of things are hardwired to paths like sysconfdir. That's why we install with both "prefix" and "DESTDIR"
  