Add a necessary include.

diff --git a/source/matrix_free/vector_data_exchange.cc b/source/matrix_free/vector_data_exchange.cc
index f4b81fba22b66e7db5d58cb007f3531ae4e2dfec..f30e41936f0648a1188b1ec15dde97a6ac165663 100644 (file)
--- a/source/matrix_free/vector_data_exchange.cc
+++ b/source/matrix_free/vector_data_exchange.cc
@@ -24,6 +24,8 @@
 
 #ifdef DEAL_II_WITH_64BIT_INDICES
 #  include <deal.II/base/mpi_consensus_algorithms.templates.h>
+
+#  include <boost/serialization/utility.hpp>
 #endif
 
 #include <map>