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-rw-r--r--libstdc++-v3/configure.ac3
1 files changed, 3 insertions, 0 deletions
diff --git a/libstdc++-v3/configure.ac b/libstdc++-v3/configure.ac
index a3b257f..a6c01b2 100644
--- a/libstdc++-v3/configure.ac
+++ b/libstdc++-v3/configure.ac
@@ -572,6 +572,9 @@ GLIBCXX_EMERGENCY_EH_ALLOC
# For src/c++20/tzdb.cc defaults.
GLIBCXX_ZONEINFO_DIR
+# For std::chrono formatters to use tm::tm_zone
+GLIBCXX_STRUCT_TM_TM_ZONE
+
# For src/c++11/shared_ptr.cc alignment.
GLIBCXX_CHECK_ALIGNAS_CACHELINE