From 2ef67e3896a2a7d0ba93539cf79310384470fc91 Mon Sep 17 00:00:00 2001
From: Matthias Maier <tamiko@43-1.org>
Date: Thu, 15 Feb 2024 16:03:22 -0600
Subject: [PATCH 2/2] base/mpi.h: mark a template variable to have "const
 inline" linkage.

---
 include/deal.II/base/mpi.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/deal.II/base/mpi.h b/include/deal.II/base/mpi.h
index b77fd3e7c8..8ee55fbe41 100644
--- a/include/deal.II/base/mpi.h
+++ b/include/deal.II/base/mpi.h
@@ -1728,8 +1728,8 @@ namespace Utilities
      * not satisfied.
      */
     template <typename T>
-    const MPI_Datatype
-      mpi_type_id_for_type = internal::MPIDataTypes::mpi_type_id(
+    inline const MPI_Datatype mpi_type_id_for_type =
+      internal::MPIDataTypes::mpi_type_id(
         static_cast<std::remove_cv_t<std::remove_reference_t<T>> *>(nullptr));
 #endif
 
-- 
2.43.0