From da2d7e2dde19ffe6d7bc820e196dd59bca4e1d0b Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Fri, 4 Oct 2013 20:42:23 +0000
Subject: [PATCH] Added support for automatically select Lua 5.2 is it's
 available, then falling back to checking for Lua 5.1 otherwise.

---
 CMakeLists.txt                         | 6 ++++--
 src/osgPlugins/lua/LuaScriptEngine.cpp | 6 +++---
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3242edc68..47ef3f4b1 100644
--- a/CMakeLists.txt
+++ b/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()
diff --git a/src/osgPlugins/lua/LuaScriptEngine.cpp b/src/osgPlugins/lua/LuaScriptEngine.cpp
index 9fe8d363e..0c8172171 100644
--- a/src/osgPlugins/lua/LuaScriptEngine.cpp
+++ b/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
 {