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diff --git a/extern/curve_fit_nd/intern/generic_heap.h b/extern/curve_fit_nd/intern/generic_heap.h
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+/*
+ * Copyright (c) 2016, Blender Foundation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the <organization> nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __GENERIC_HEAP_H__
+#define __GENERIC_HEAP_H__
+
+/** \file generic_heap.h
+ *  \ingroup curve_fit
+ */
+
+struct Heap;
+struct HeapNode;
+typedef struct Heap Heap;
+typedef struct HeapNode HeapNode;
+
+typedef void (*HeapFreeFP)(void *ptr);
+
+Heap        *HEAP_new(unsigned int tot_reserve);
+bool         HEAP_is_empty(Heap *heap);
+void         HEAP_free(Heap *heap, HeapFreeFP ptrfreefp);
+void        *HEAP_node_ptr(HeapNode *node);
+void         HEAP_remove(Heap *heap, HeapNode *node);
+HeapNode    *HEAP_insert(Heap *heap, double value, void *ptr);
+void        *HEAP_popmin(Heap *heap);
+void         HEAP_clear(Heap *heap, HeapFreeFP ptrfreefp);
+unsigned int HEAP_size(Heap *heap);
+HeapNode    *HEAP_top(Heap *heap);
+double       HEAP_top_value(Heap *heap);
+double       HEAP_node_value(HeapNode *node);
+
+#endif  /* __GENERIC_HEAP_IMPL_H__ */