3 files changed, 10 insertions, 4 deletions
diff --git a/phpBB/includes/constants.php b/phpBB/includes/constants.php
index 01300c8992..826afb3832 100644
--- a/phpBB/includes/constants.php
+++ b/phpBB/includes/constants.php
@@ -178,8 +178,8 @@ define('REFERER_VALIDATE_PATH', 2);
 
 // phpbb_chmod() permissions
 define('CHMOD_ALL', 7);
-define('CHMOD_READ', 4);
-define('CHMOD_WRITE', 2);
+@define('CHMOD_READ', 4);
+@define('CHMOD_WRITE', 2);
 define('CHMOD_EXECUTE', 1);
 
 // Additional constants
diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index b3fbd94159..5fcaece0d6 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -3131,7 +3131,7 @@ function msg_handler($errno, $msg_text, $errfile, $errline)
 				}
 
 				// Another quick fix for those having gzip compression enabled, but do not flush if the coder wants to catch "something". ;)
-				if ($config['gzip_compress'])
+				if (!empty($config['gzip_compress']))
 				{
 					if (@extension_loaded('zlib') && !headers_sent() && !ob_get_level())
 					{
@@ -3854,7 +3854,7 @@ function exit_handler()
 	}
 
 	// As a pre-caution... some setups display a blank page if the flush() is not there.
-	(!$config['gzip_compress']) ? @flush() : @ob_flush();
+	(empty($config['gzip_compress'])) ? @flush() : @ob_flush();
 
 	exit;
 }
diff --git a/phpBB/install/index.php b/phpBB/install/index.php
index 3702558cbc..dc40d7bea0 100644
--- a/phpBB/install/index.php
+++ b/phpBB/install/index.php
@@ -230,6 +230,12 @@ include($phpbb_root_path . 'language/' . $language . '/acp/board.' . $phpEx);
 include($phpbb_root_path . 'language/' . $language . '/install.' . $phpEx);
 include($phpbb_root_path . 'language/' . $language . '/posting.' . $phpEx);
 
+// usually we would need every single constant here - and it would be consistent. For 3.0.x, use a dirty hack... :(
+
+// Define needed constants
+define('CHMOD_READ', 4);
+define('CHMOD_WRITE', 2);
+
 $mode = request_var('mode', 'overview');
 $sub = request_var('sub', '');