Index: rustc.git/src/bootstrap/bootstrap.py
===================================================================
--- rustc.git.orig/src/bootstrap/bootstrap.py
+++ rustc.git/src/bootstrap/bootstrap.py
@@ -83,7 +83,7 @@ def _download(path, url, probably_big, v
         run(["curl", option,
              "-y", "30", "-Y", "10",    # timeout if speed is < 10 bytes/sec for > 30 seconds
              "--connect-timeout", "30",  # timeout if cannot connect within 30 seconds
-             "--retry", "3", "-Sf", "-o", path, url],
+             "--retry", "3", "-Sf", "-o", path, "-R", url],
             verbose=verbose,
             exception=exception)