Bug: https://bugs.gentoo.org/634220

--- a/src/3rdparty/chromium/v8/BUILD.gn
+++ b/src/3rdparty/chromium/v8/BUILD.gn
@@ -661,6 +661,7 @@ action("run_mksnapshot") {
 
   deps = [
     ":mksnapshot($v8_snapshot_toolchain)",
+    ":run_paxmark",
   ]
 
   script = "tools/run.py"
@@ -706,6 +707,28 @@ action("run_mksnapshot") {
     args += [ rebase_path(v8_embed_script, root_build_dir) ]
   }
 }
+action("run_paxmark") {
+  visibility = [ ":*" ]  # Only targets in this file can depend on this.
+
+  deps = [
+    ":mksnapshot($v8_snapshot_toolchain)",
+  ]
+
+  script = "/usr/sbin/pypaxctl"
+
+  sources = []
+
+  outputs = [
+     "$target_out_dir/mksnapshot",
+  ]
+
+  args = [
+    "-sm",
+    "./" + rebase_path(get_label_info(":mksnapshot($v8_snapshot_toolchain)",
+                                      "root_out_dir") + "/mksnapshot",
+                       root_build_dir),
+  ]
+}
 
 action("run_mkpeephole") {
   visibility = [ ":*" ]  # Only targets in this file can depend on this.