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-rw-r--r--boost/geometry/algorithms/append.hpp4
1 files changed, 3 insertions, 1 deletions
diff --git a/boost/geometry/algorithms/append.hpp b/boost/geometry/algorithms/append.hpp
index 1a8828b..6ffb5f9 100644
--- a/boost/geometry/algorithms/append.hpp
+++ b/boost/geometry/algorithms/append.hpp
@@ -22,8 +22,10 @@
#include <boost/range.hpp>
-#include <boost/variant/static_visitor.hpp>
+
#include <boost/variant/apply_visitor.hpp>
+#include <boost/variant/static_visitor.hpp>
+#include <boost/variant/variant_fwd.hpp>
#include <boost/geometry/algorithms/num_interior_rings.hpp>
#include <boost/geometry/algorithms/detail/convert_point_to_point.hpp>