diff --git a/core-legacy/sourcehook/generate/sourcehook.h b/core-legacy/sourcehook/generate/sourcehook.h
index a75e271..8fdc3ff 100644
--- a/core-legacy/sourcehook/generate/sourcehook.h
+++ b/core-legacy/sourcehook/generate/sourcehook.h
@@ -29,7 +29,7 @@
 //     This is not a SH_IFACE_VERSION change so that old plugins continue working!
 // 5 - addition of direct vp hooks (new hook mode; from now on AddHookNew checks for
 //	   invalid hookmode -> impl version won't have to change because of things like this)
-#define SH_IMPL_VERSION 5
+#define SH_IMPL_VERSION 4
 
 // Hookman version:
 //  1 - Support for recalls, performance optimisations
diff --git a/core-legacy/sourcehook/sh_listcat.h b/core-legacy/sourcehook/sh_listcat.h
new file mode 100755
index 0000000..8eb74ca
--- /dev/null
+++ b/core-legacy/sourcehook/sh_listcat.h
@@ -0,0 +1,147 @@
+/* ======== SourceMM ========
+* Copyright (C) 2004-2007 Metamod:Source Development Team
+* No warranties of any kind
+*
+* License: zlib/libpng
+*
+* Author(s): Pavol "PM OnoTo" Marko
+* ============================
+*/
+
+// Used for VP-Hooks
+
+#ifndef _INCLUDE_SMM_LISTCAT_H
+#define _INCLUDE_SMM_LISTCAT_H
+
+#include "sh_list.h"
+
+namespace SourceHook
+{
+
+	// Only a very special-case forward iterator!
+	template <typename T>
+	class ListCatIterator
+	{
+		List<T> *m_pListLeft;
+		List<T> *m_pListRight;
+		typename List<T>::iterator m_Iter;
+
+		void CheckLeftEmptyOnBegin()
+		{
+			// If the left list is empty and right is valid, GoToBegin sets m_Iter to m_Left
+			// End() checks for equality to m_Right.end() so it returns false
+			// then Next() corrupts by incrementing!
+
+			// To avoid this, we skip left if it's empty.
+			if (m_pListLeft && m_pListLeft->empty() && m_pListRight)
+			{
+				m_Iter = m_pListRight->begin();
+			}
+		}
+	public:
+		// At least one list has to be non-null!
+		ListCatIterator(List<T> *pListLeft, List<T> *pListRight) : m_pListLeft(pListLeft), m_pListRight(pListRight),
+			m_Iter(pListLeft ? pListLeft->begin() : pListRight->begin())
+		{
+			CheckLeftEmptyOnBegin();
+		}
+
+		void GoToBegin()
+		{
+			m_Iter = m_pListLeft ? m_pListLeft->begin() : m_pListRight->begin();
+			CheckLeftEmptyOnBegin();
+		}
+
+		bool End()
+		{
+			return m_pListRight ? (m_Iter == m_pListRight->end())
+				: (m_Iter == m_pListLeft->end());
+		}
+
+		//pre increment
+		ListCatIterator & operator++()
+		{
+			++m_Iter;
+			if (m_pListLeft && m_Iter == m_pListLeft->end())
+			{
+				if (m_pListRight)
+					m_Iter = m_pListRight->begin();
+			}
+			return *this;
+		}
+		//post increment
+		ListCatIterator operator++(int)
+		{
+			ListCatIterator old(*this);
+			
+			++m_Iter;
+			if (m_pListLeft && m_Iter == m_pListLeft->end())
+			{
+				if (m_pListRight)
+					m_Iter = m_pListRight->begin();
+			}
+
+			return old;
+		}
+
+		const T & operator * () const
+		{
+			return *m_Iter;
+		}
+		T & operator * ()
+		{
+			return *m_Iter;
+		}
+
+		T * operator -> ()
+		{
+			return &(*m_Iter);
+		}
+		const T * operator -> () const
+		{
+			return &(*m_Iter);
+		}
+
+		bool operator != (const typename List<T>::iterator &where) const
+		{
+			return (m_Iter != where);
+		}
+		bool operator ==(const typename List<T>::iterator &where) const
+		{
+			return (m_Iter == where);
+		}
+
+		ListCatIterator & operator = (const typename List<T>::iterator &where)
+		{
+			m_Iter = where;
+
+			if (m_pListLeft && m_Iter == m_pListLeft->end())
+			{
+				if (m_pListRight)
+					m_Iter = m_pListRight->begin();
+
+				// :HACK HACK: RemoveHookById is not aware of ListCatIterator (yet? :TODO: Change it!)
+				// So we have to do this here... (look for the "Move all iterators pointing at this" section)
+				--m_Iter;
+			}
+
+			return *this;
+		}
+
+		ListCatIterator & operator = (const ListCatIterator<T> &other)
+		{
+			m_Iter = other.m_Iter;
+			m_pListLeft = other.m_pListLeft;
+			m_pListRight = other.m_pListRight;
+			return *this;
+		}
+
+		void SetListLeft(List<T> *pList)
+		{
+			m_pListLeft = pList;
+		}
+	};
+}
+
+#endif
+
diff --git a/core-legacy/util.h b/core-legacy/util.h
index 946e417..6ee9bc9 100644
--- a/core-legacy/util.h
+++ b/core-legacy/util.h
@@ -12,7 +12,7 @@
 #define _INCLUDE_UTIL_H
 
 #include <stdarg.h>
-#include <sourcehook/sourcehook.h>
+#include "sourcehook/sourcehook.h"
 
 /**
  * @brief Utility functions