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 e72a175764c715649f4e99446dc2d0300c514554..38e8122f10ed26fb5166362beba978bc590a2419 100644 (file)
--- a/source/base/mpi.cc
+++ b/source/base/mpi.cc
@@ -23,6 +23,7 @@
 #include <deal.II/lac/la_parallel_block_vector.h>
 #include <deal.II/base/multithread_info.h>
 
+#include <numeric> 
 #include <iostream>
 
 #ifdef DEAL_II_WITH_TRILINOS