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/usr/include/lua5.1/lua.hpp is in liblua5.1-0-dev 5.1.5-7.1.

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// lua.hpp
// Lua header files for C++
// <<extern "C">> not supplied automatically because Lua also compiles as C++

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