Hey there! Nice work on the engine, it looks great. I had to make a few changes to compile it under Linux. You can find the patch here: http://pastebin.com/Nt7bSmbF This was a quick fix for my particular system but might point to a way to get it to work in general. Do you prefer to stick with the '3rdparty' directory idea or have it work with external installed libraries in Linux (by package manager, for example)?
Looking forward to playing around with this!