Added support for automatically select Lua 5.2 is it's available, then falling back to checking for Lua 5.1 otherwise.

CMakeLists.txt

@@ -539,8 +539,10 @@ ELSE()
         FIND_PACKAGE(Asio)
     ENDIF()
     FIND_PACKAGE(ZeroConf)
-    #FIND_PACKAGE(Lua52)
-    FIND_PACKAGE(Lua51)
+    FIND_PACKAGE(Lua52)
+    IF (NOT (LUA_LIBRARIES AND LUA_INCLUDE_DIR))
+        FIND_PACKAGE(Lua51)
+    ENDIF()
     FIND_PACKAGE(V8)
     FIND_PACKAGE(PythonLibs)
 ENDIF()

src/osgPlugins/lua/LuaScriptEngine.cpp

@@ -17,8 +17,6 @@
 
 using namespace lua;
 
-#define USE_USERDATA_FOR_POINTER 1
-
 static int getProperty(lua_State * _lua)
 {
     const LuaScriptEngine* lse = reinterpret_cast<const LuaScriptEngine*>(lua_topointer(_lua, lua_upvalueindex(1)));
@@ -275,7 +273,9 @@ public:
     virtual void apply(const osg::Matrixd& value)       { _lsg->pushValue(value); }
 };
 
-#define lua_rawlen lua_strlen
+#if LUA_VERSION_NUM<=501
+    #define lua_rawlen lua_strlen
+#endif
 
 class GetStackValueVisitor : public osg::ValueObject::SetValueVisitor
 {