From f83b6e1130e3193dd9480ca5d60b764870de9d3f Mon Sep 17 00:00:00 2001
From: Shea Levy <shea@shealevy.com>
Date: Wed, 24 Jan 2018 21:58:57 -0800
Subject: [PATCH] unpackPhase: Handle sources starting with a hyphen

---
 pkgs/stdenv/generic/setup.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/stdenv/generic/setup.sh b/pkgs/stdenv/generic/setup.sh
index dbbe45e45f3f..e4a77af199b9 100644
--- a/pkgs/stdenv/generic/setup.sh
+++ b/pkgs/stdenv/generic/setup.sh
@@ -769,7 +769,7 @@ _defaultUnpack() {
         # We can't preserve hardlinks because they may have been
         # introduced by store optimization, which might break things
         # in the build.
-        cp -pr --reflink=auto "$fn" "$(stripHash "$fn")"
+        cp -pr --reflink=auto -- "$fn" "$(stripHash "$fn")"
 
     else