anchor.diff:  
     hardeningDisable = [ "format" ];
   
  -  nativeBuildInputs = [ pkgconfig intltool itstool libxml2 gobject-introspection vala ];
  +  nativeBuildInputs = [ pkg-config intltool itstool libxml2 gobject-introspection vala ];
     buildInputs = with stdenv.lib; [ gtk3 openssl libgee ]
       ++ optional (mysqlSupport) libmysqlclient
       ++ optional (postgresSupport) postgresql;
  
positive.code: { stdenv, fetchurl, pkgconfig, intltool, itstool, libxml2, gtk3, openssl, gnome3, gobject-introspection, vala, libgee
  , overrideCC, gcc6
  , mysqlSupport ? false, libmysqlclient ? null
  , postgresSupport ? false, postgresql ? null
  
negative.code:     sha256 = "1j1l4dwjgw6w4d1v4bl5a4kwyj7bcih8mj700ywm7xakh1xxyv3g";
    };
    configureFlags = with stdenv.lib; [
      "--with-mysql=${if mysqlSupport then "yes" else "no"}"
      "--with-postgres=${if postgresSupport then "yes" else "no"}"
  
  