diff -up ./src/3rdparty/gn/build/gen.py.gnt64 ./src/3rdparty/gn/build/gen.py
--- ./src/3rdparty/gn/build/gen.py.gnt64	2025-05-29 10:27:28.000000000 +0900
+++ ./src/3rdparty/gn/build/gen.py	2026-05-13 19:13:35.441468535 +0900
@@ -530,6 +530,8 @@ def WriteGNNinja(path, platform, host, o
       cflags.append('-Werror')
 
     cflags.extend([
+        '-fcf-protection=none',
+        '-D_TIME_BITS=64',
         '-D_FILE_OFFSET_BITS=64',
         '-D__STDC_CONSTANT_MACROS', '-D__STDC_FORMAT_MACROS',
         '-pthread',