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diff --git a/src/libvpsc/blocks.h b/src/libvpsc/blocks.h
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+++ b/src/libvpsc/blocks.h
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+/**
+ * \brief A block structure defined over the variables
+ *
+ * A block structure defined over the variables such that each block contains
+ * 1 or more variables, with the invariant that all constraints inside a block
+ * are satisfied by keeping the variables fixed relative to one another
+ *
+ * Authors:
+ *   Tim Dwyer <tgdwyer@gmail.com>
+ *
+ * Copyright (C) 2005 Authors
+ *
+ * Released under GNU LGPL.  Read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_REMOVEOVERLAP_BLOCKS_H
+#define SEEN_REMOVEOVERLAP_BLOCKS_H
+
+#ifdef RECTANGLE_OVERLAP_LOGGING
+#define LOGFILE "cRectangleOverlap.log"
+#endif
+
+#include <set>
+#include <list>
+
+class Block;
+class Variable;
+class Constraint;
+/**
+ * A block structure defined over the variables such that each block contains
+ * 1 or more variables, with the invariant that all constraints inside a block
+ * are satisfied by keeping the variables fixed relative to one another
+ */
+class Blocks : public std::set<Block*>
+{
+public:
+	Blocks(const int n, Variable* const vs[]);
+	~Blocks(void);
+	void mergeLeft(Block *r);
+	void mergeRight(Block *l);
+	void split(Block *b, Block *&l, Block *&r, Constraint *c);
+	std::list<Variable*> *totalOrder();
+	void cleanup();
+	double cost();
+private:
+	void dfsVisit(Variable *v, std::list<Variable*> *order);
+	void removeBlock(Block *doomed);
+	Variable* const *vs;
+	int nvs;
+};
+
+extern long blockTimeCtr;
+#endif // SEEN_REMOVEOVERLAP_BLOCKS_H