--- a/hglib.lua	Sat Sep 10 08:04:17 2016 +0800
+++ b/hglib.lua	Sat Sep 10 10:41:17 2016 +0800
@@ -1,5 +1,7 @@
 local lpc = require('lpc')
 
+local unpack = table.unpack or unpack -- luacheck: ignore undefined variable unpack
+
 local sizes = { i4 = 4, u4 = 4, c = 1 }
 
 local function write_u4(wh, value)