diff --git a/wp-admin/setup-config.php b/wp-admin/setup-config.php
index 32939d0717..abab9904de 100644
--- a/wp-admin/setup-config.php
+++ b/wp-admin/setup-config.php
@@ -51,6 +51,12 @@ if (file_exists(ABSPATH . 'wp-config.php'))
 if (file_exists(ABSPATH . '../wp-config.php') && ! file_exists(ABSPATH . '../wp-settings.php'))
 	wp_die("<p>The file 'wp-config.php' already exists one level above your WordPress installation. If you need to reset any of the configuration items in this file, please delete it first. You may try <a href='install.php'>installing now</a>.</p>");
 
+if ( version_compare( '4.3', phpversion(), '>' ) )
+	wp_die( sprintf( /*WP_I18N_OLD_PHP*/'Your server is running PHP version %s but WordPress requires at least 4.3.'/*/WP_I18N_OLD_PHP*/, phpversion() ) );
+
+if ( !extension_loaded('mysql') && !file_exists(ABSPATH . 'wp-content/db.php') )
+	wp_die( /*WP_I18N_OLD_MYSQL*/'Your PHP installation appears to be missing the MySQL extension which is required by WordPress.'/*/WP_I18N_OLD_MYSQL*/ );
+
 if (isset($_GET['step']))
 	$step = $_GET['step'];
 else