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/usr/include/luajit-2.0/lua.hpp is in libluajit-5.1-dev 2.0.4+dfsg-1.

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// C++ wrapper for LuaJIT header files.

extern "C" {
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include "luajit.h"
}