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diff --git a/externals/g3dlite/ReferenceCount.cpp b/externals/g3dlite/ReferenceCount.cpp
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+++ b/externals/g3dlite/ReferenceCount.cpp
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+/**
+  @file ReferenceCount.cpp
+
+  Reference Counting Garbage Collector for C++
+
+  @maintainer Morgan McGuire, http://graphics.cs.williams.edu
+  @cite Adapted and extended from Justin Miller's "RGC" class that appeared in BYTE magazine.
+  @cite See also http://www.jelovic.com/articles/cpp_without_memory_errors_slides.htm
+
+  @created 2001-10-23
+  @edited  2009-04-25
+*/
+#include "G3D/platform.h"
+#include "G3D/ReferenceCount.h"
+
+namespace G3D {
+
+ReferenceCountedObject::ReferenceCountedObject() : 
+    ReferenceCountedObject_refCount(0), 
+    ReferenceCountedObject_weakPointer(0) {
+
+    debugAssertM(isValidHeapPointer(this), 
+        "Reference counted objects must be allocated on the heap.");
+}
+
+void ReferenceCountedObject::ReferenceCountedObject_zeroWeakPointers() {
+    // Tell all of my weak pointers that I'm gone.
+    
+    _WeakPtrLinkedList* node = ReferenceCountedObject_weakPointer;
+
+    while (node != NULL) {
+        // Notify the weak pointer that it is going away
+        node->weakPtr->objectCollected();
+
+        // Free the node and advance
+        _WeakPtrLinkedList* tmp = node;
+        node = node->next;
+        delete tmp;
+    }
+}
+
+ReferenceCountedObject::~ReferenceCountedObject() {}
+
+
+ReferenceCountedObject::ReferenceCountedObject(const ReferenceCountedObject& notUsed) : 
+    ReferenceCountedObject_refCount(0),
+    ReferenceCountedObject_weakPointer(0) {
+    (void)notUsed;
+    debugAssertM(G3D::isValidHeapPointer(this), 
+        "Reference counted objects must be allocated on the heap.");
+}
+
+ReferenceCountedObject& ReferenceCountedObject::operator=(const ReferenceCountedObject& other) {
+    (void)other;
+    // Nothing changes when I am assigned; the reference count on
+    // both objects is the same (although my super-class probably
+    // changes).
+    return *this;
+}
+
+} // G3D