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-rw-r--r--pkgs/development/tools/misc/arcanist/default.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/development/tools/misc/arcanist/default.nix b/pkgs/development/tools/misc/arcanist/default.nix
index 15b8f82d0ab2..1e183d2dc69a 100644
--- a/pkgs/development/tools/misc/arcanist/default.nix
+++ b/pkgs/development/tools/misc/arcanist/default.nix
@@ -22,8 +22,8 @@ stdenv.mkDerivation rec {
   buildInputs = [ php makeWrapper flex ];
 
   unpackPhase = ''
-    cp -R ${libphutil} libphutil
-    cp -R ${arcanist} arcanist
+    cp -aR ${libphutil} libphutil
+    cp -aR ${arcanist} arcanist
     chmod +w -R libphutil arcanist
   '';