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diff --git a/src/glu/sgi/libtess/priorityq-heap.h b/src/glu/sgi/libtess/priorityq-heap.h
deleted file mode 100644
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--- a/src/glu/sgi/libtess/priorityq-heap.h
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@@ -1,107 +0,0 @@
-/*
- * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
- * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice including the dates of first publication and
- * either this permission notice or a reference to
- * http://oss.sgi.com/projects/FreeB/
- * shall be included in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
- * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
- * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- *
- * Except as contained in this notice, the name of Silicon Graphics, Inc.
- * shall not be used in advertising or otherwise to promote the sale, use or
- * other dealings in this Software without prior written authorization from
- * Silicon Graphics, Inc.
- */
-/*
-** Author: Eric Veach, July 1994.
-**
-*/
-
-#ifndef __priorityq_heap_h_
-#define __priorityq_heap_h_
-
-/* Use #define's so that another heap implementation can use this one */
-
-#define PQkey			PQHeapKey
-#define PQhandle		PQHeapHandle
-#define PriorityQ		PriorityQHeap
-
-#define pqNewPriorityQ(leq)	__gl_pqHeapNewPriorityQ(leq)
-#define pqDeletePriorityQ(pq)	__gl_pqHeapDeletePriorityQ(pq)
-
-/* The basic operations are insertion of a new key (pqInsert),
- * and examination/extraction of a key whose value is minimum
- * (pqMinimum/pqExtractMin).  Deletion is also allowed (pqDelete);
- * for this purpose pqInsert returns a "handle" which is supplied
- * as the argument.
- *
- * An initial heap may be created efficiently by calling pqInsert
- * repeatedly, then calling pqInit.  In any case pqInit must be called
- * before any operations other than pqInsert are used.
- *
- * If the heap is empty, pqMinimum/pqExtractMin will return a NULL key.
- * This may also be tested with pqIsEmpty.
- */
-#define pqInit(pq)		__gl_pqHeapInit(pq)
-#define pqInsert(pq,key)	__gl_pqHeapInsert(pq,key)
-#define pqMinimum(pq)		__gl_pqHeapMinimum(pq)
-#define pqExtractMin(pq)	__gl_pqHeapExtractMin(pq)
-#define pqDelete(pq,handle)	__gl_pqHeapDelete(pq,handle)
-#define pqIsEmpty(pq)		__gl_pqHeapIsEmpty(pq)
-
-
-/* Since we support deletion the data structure is a little more
- * complicated than an ordinary heap.  "nodes" is the heap itself;
- * active nodes are stored in the range 1..pq->size.  When the
- * heap exceeds its allocated size (pq->max), its size doubles.
- * The children of node i are nodes 2i and 2i+1.
- *
- * Each node stores an index into an array "handles".  Each handle
- * stores a key, plus a pointer back to the node which currently
- * represents that key (ie. nodes[handles[i].node].handle == i).
- */
-
-typedef void *PQkey;
-typedef long PQhandle;
-typedef struct PriorityQ PriorityQ;
-
-typedef struct { PQhandle handle; } PQnode;
-typedef struct { PQkey key; PQhandle node; } PQhandleElem;
-
-struct PriorityQ {
-  PQnode	*nodes;
-  PQhandleElem	*handles;
-  long		size, max;
-  PQhandle	freeList;
-  int		initialized;
-  int		(*leq)(PQkey key1, PQkey key2);
-};
-  
-PriorityQ	*pqNewPriorityQ( int (*leq)(PQkey key1, PQkey key2) );
-void		pqDeletePriorityQ( PriorityQ *pq );
-
-void		pqInit( PriorityQ *pq );
-PQhandle	pqInsert( PriorityQ *pq, PQkey key );
-PQkey		pqExtractMin( PriorityQ *pq );
-void		pqDelete( PriorityQ *pq, PQhandle handle );
-
-
-#define __gl_pqHeapMinimum(pq)	((pq)->handles[(pq)->nodes[1].handle].key)
-#define __gl_pqHeapIsEmpty(pq)	((pq)->size == 0)
-
-#endif