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-rw-r--r--boost/geometry/core/exterior_ring.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/boost/geometry/core/exterior_ring.hpp b/boost/geometry/core/exterior_ring.hpp
index e5c97dd301..fa5a0a2b98 100644
--- a/boost/geometry/core/exterior_ring.hpp
+++ b/boost/geometry/core/exterior_ring.hpp
@@ -17,6 +17,7 @@
#include <boost/mpl/assert.hpp>
+#include <boost/type_traits/is_const.hpp>
#include <boost/type_traits/remove_const.hpp>