From 645e599e9361afc85c77ec76f724e6ffd1822ca8 Mon Sep 17 00:00:00 2001
From: LLVM GN Syncbot <llvmgnsyncbot@gmail.com>
Date: Wed, 7 Jul 2021 10:14:59 +0000
Subject: [PATCH] [gn build] Port 6829db727e9e

---
 llvm/utils/gn/secondary/libcxx/include/BUILD.gn | 1 +
 1 file changed, 1 insertion(+)

diff --git a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
index b50e2a543984..c0fa80aebc71 100644
--- a/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
+++ b/llvm/utils/gn/secondary/libcxx/include/BUILD.gn
@@ -244,6 +244,7 @@ if (current_toolchain == default_toolchain) {
       "__ranges/access.h",
       "__ranges/all.h",
       "__ranges/concepts.h",
+      "__ranges/copyable_box.h",
       "__ranges/data.h",
       "__ranges/drop_view.h",
       "__ranges/empty.h",