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-rw-r--r--boost/icl/closed_interval.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/boost/icl/closed_interval.hpp b/boost/icl/closed_interval.hpp
index 238be12ac8..a0278e8250 100644
--- a/boost/icl/closed_interval.hpp
+++ b/boost/icl/closed_interval.hpp
@@ -8,6 +8,7 @@ Copyright (c) 2010-2010: Joachim Faulhaber
#ifndef BOOST_ICL_CLOSED_INTERVAL_HPP_JOFA_100324
#define BOOST_ICL_CLOSED_INTERVAL_HPP_JOFA_100324
+#include <boost/icl/detail/concept_check.hpp>
#include <boost/icl/concept/interval.hpp>
#include <boost/icl/type_traits/value_size.hpp>
#include <boost/icl/type_traits/type_to_string.hpp>