From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Thu, 23 Dec 2021 03:01:08 +0000 (-0700)
Subject: Add a necessary include file.
X-Git-Tag: v9.4.0-rc1~718^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F13112%2Fhead;p=dealii.git

Add a necessary include file.
---

diff --git a/include/deal.II/base/thread_local_storage.h b/include/deal.II/base/thread_local_storage.h
index 10a9388b30..115df60ad7 100644
--- a/include/deal.II/base/thread_local_storage.h
+++ b/include/deal.II/base/thread_local_storage.h
@@ -24,6 +24,7 @@
 #  include <list>
 #  include <map>
 #  include <memory>
+#  include <mutex>
 #  include <shared_mutex>
 #  include <thread>
 #  include <vector>