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diff --git a/gprof/cg_arcs.h b/gprof/cg_arcs.h
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+/* Copyright (C) 2012-2014 Free Software Foundation, Inc.
+
+   This file is part of GNU Binutils.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+   MA 02110-1301, USA.  */
+
+#ifndef cg_arcs_h
+#define cg_arcs_h
+
+/*
+ * Arc structure for call-graph.
+ *
+ * With pointers to the symbols of the parent and the child, a count
+ * of how many times this arc was traversed, and pointers to the next
+ * parent of this child and the next child of this parent.
+ */
+typedef struct arc
+  {
+    Sym *parent;		/* source vertice of arc */
+    Sym *child;			/* dest vertice of arc */
+    unsigned long count;	/* # of calls from parent to child */
+    double time;		/* time inherited along arc */
+    double child_time;		/* child-time inherited along arc */
+    struct arc *next_parent;	/* next parent of CHILD */
+    struct arc *next_child;	/* next child of PARENT */
+    int has_been_placed;	/* have this arc's functions been placed? */
+  }
+Arc;
+
+extern unsigned int num_cycles;	/* number of cycles discovered */
+extern Sym *cycle_header;	/* cycle headers */
+
+extern void arc_add (Sym * parent, Sym * child, unsigned long count);
+extern Arc *arc_lookup (Sym * parent, Sym * child);
+extern Sym **cg_assemble (void);
+extern Arc **arcs;
+extern unsigned int numarcs;
+
+#endif /* cg_arcs_h */