--- protobuf-21.2/src/google/protobuf/port_def.inc.orig	2022-07-03 09:45:35.196880191 +0200
+++ protobuf-21.2/src/google/protobuf/port_def.inc	2022-07-03 09:46:17.673245305 +0200
@@ -651,7 +651,11 @@
 #define PROTOBUF_CONSTINIT [[clang::require_constant_initialization]]
 #define PROTOBUF_CONSTEXPR constexpr
 #elif PROTOBUF_GNUC_MIN(12, 2)
+#if PROTOBUF_CPLUSPLUS_MIN(201703L)
 #define PROTOBUF_CONSTINIT __constinit
+#else
+#define PROTOBUF_CONSTINIT
+#endif
 #define PROTOBUF_CONSTEXPR constexpr
 #else
 #define PROTOBUF_CONSTINIT