diff -up iridium-browser-2022.11.107/third_party/wayland/src/src/wayland-shm.c.me iridium-browser-2022.11.107/third_party/wayland/src/src/wayland-shm.c
--- iridium-browser-2022.11.107/third_party/wayland/src/src/wayland-shm.c.me	2022-11-18 12:07:56.724329365 +0100
+++ iridium-browser-2022.11.107/third_party/wayland/src/src/wayland-shm.c	2022-11-18 12:18:38.009916441 +0100
@@ -45,6 +45,13 @@
 #include <errno.h>
 #include <fcntl.h>
 
+#ifndef F_GET_SEALS
+#define F_GET_SEALS 1034  /* Get seals for file. */
+#endif
+#ifndef F_SEAL_SHRINK
+#define F_SEAL_SHRINK 0x0002  /* Prevent file from shrinking. */
+#endif
+
 #include "wayland-util.h"
 #include "wayland-private.h"
 #include "wayland-server.h"