From 23cd685d7a46cc5d601c9b937f6a849c8753fa32 Mon Sep 17 00:00:00 2001
From: Marc Glisse <marc.glisse@inria.fr>
Date: Thu, 26 Nov 2020 22:20:53 +0100
Subject: handle old boost

---
 src/Subsampling/include/gudhi/sparsify_point_set.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/Subsampling/include/gudhi/sparsify_point_set.h b/src/Subsampling/include/gudhi/sparsify_point_set.h
index 71e8917b..4571b8f3 100644
--- a/src/Subsampling/include/gudhi/sparsify_point_set.h
+++ b/src/Subsampling/include/gudhi/sparsify_point_set.h
@@ -11,7 +11,12 @@
 #ifndef SPARSIFY_POINT_SET_H_
 #define SPARSIFY_POINT_SET_H_
 
-#include <boost/iterator/function_output_iterator.hpp>
+#include <boost/version.hpp>
+#if BOOST_VERSION < 106600
+# include <boost/function_output_iterator.hpp>
+#else
+# include <boost/iterator/function_output_iterator.hpp>
+#endif
 
 #include <gudhi/Kd_tree_search.h>
 #ifdef GUDHI_SUBSAMPLING_PROFILING
@@ -53,7 +58,6 @@ sparsify_point_set(
                    OutputIterator output_it) {
   typedef typename Gudhi::spatial_searching::Kd_tree_search<
       Kernel, Point_range> Points_ds;
-  using std::sqrt;
 
 #ifdef GUDHI_SUBSAMPLING_PROFILING
   Gudhi::Clock t;
-- 
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