--- buildtools/third_party/libc++/BUILD.gn.orig	2021-09-19 10:01:13 UTC
+++ buildtools/third_party/libc++/BUILD.gn
@@ -23,6 +23,7 @@ config("config") {
     cflags += [
       "-fPIC",
       "-std=c++17",
+      "-I%%LOCALBASE%%/include",
     ]
   }
 }