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diff --git a/src/2geom/utils.h b/src/2geom/utils.h
index 2be995248..5ab191749 100644
--- a/src/2geom/utils.h
+++ b/src/2geom/utils.h
@@ -1,8 +1,11 @@
-#ifndef UTILS_HEADER
-#define UTILS_HEADER
+#ifndef LIB2GEOM_UTILS_HEADER
+#define LIB2GEOM_UTILS_HEADER
 
-/** Various utility functions.
+/**
+ * \file
+ * \brief  Various utility functions.
  *
+ * Copyright 2007 Johan Engelen <goejendaagh@zonnet.nl>
  * Copyright 2006 Michael G. Sloan <mgsloan@gmail.com>
  *
  * This library is free software; you can redistribute it and/or
@@ -31,12 +34,9 @@
  */
 
 #include <cmath>
-#include <stdexcept>
+#include <vector>
 
-class NotImplemented : public std::logic_error {
-public:
-  NotImplemented() : std::logic_error("method not implemented") {}
-};
+namespace Geom {
 
 // proper logical xor
 inline bool logical_xor (bool a, bool b) { return (a || b) && !(a && b); }
@@ -79,4 +79,20 @@ inline double decimal_round(double const x, int const places) {
     return round( x * multiplier ) / multiplier;
 }
 
+
+void binomial_coefficients(std::vector<size_t>& bc, size_t n);
+
+}
+
 #endif
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :