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diff --git a/third_party/jpeg-xl/lib/jxl/base/override.h b/third_party/jpeg-xl/lib/jxl/base/override.h
new file mode 100644
index 0000000000..1f8b657974
--- /dev/null
+++ b/third_party/jpeg-xl/lib/jxl/base/override.h
@@ -0,0 +1,29 @@
+// Copyright (c) the JPEG XL Project Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#ifndef LIB_JXL_BASE_OVERRIDE_H_
+#define LIB_JXL_BASE_OVERRIDE_H_
+
+// 'Trool' for command line arguments: force enable/disable, or use default.
+
+namespace jxl {
+
+// No effect if kDefault, otherwise forces a feature (typically a FrameHeader
+// flag) on or off.
+enum class Override : int { kOn = 1, kOff = 0, kDefault = -1 };
+
+static inline Override OverrideFromBool(bool flag) {
+  return flag ? Override::kOn : Override::kOff;
+}
+
+static inline bool ApplyOverride(Override o, bool default_condition) {
+  if (o == Override::kOn) return true;
+  if (o == Override::kOff) return false;
+  return default_condition;
+}
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_BASE_OVERRIDE_H_