Fix: 'iota' is not a member of 'std'

Fixes GCC compilation error:
 /source/base/mpi.cc:129:7: error: 'iota' is not a member of 'std'
That appears on newer gcc

diff --git a/source/base/mpi.cc b/source/base/mpi.cc
index b7fa8393c274635c575008882c4d168e9820915d..8e952529ae09f47d70748bea76bc73841a8abcf9 100644 (file)
--- a/source/base/mpi.cc
+++ b/source/base/mpi.cc
@@ -24,6 +24,7 @@
 #include <deal.II/lac/la_parallel_vector.h>
 #include <deal.II/lac/vector_memory.h>
 
+#include <numeric> 
 #include <iostream>
 
 #ifdef DEAL_II_WITH_TRILINOS