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-rw-r--r--pkgs/build-support/fetchdarcs/default.nix4
1 files changed, 3 insertions, 1 deletions
diff --git a/pkgs/build-support/fetchdarcs/default.nix b/pkgs/build-support/fetchdarcs/default.nix
index ae38edee4fd..9ab57d5c05e 100644
--- a/pkgs/build-support/fetchdarcs/default.nix
+++ b/pkgs/build-support/fetchdarcs/default.nix
@@ -1,5 +1,6 @@
-{stdenvNoCC, darcs, cacert}:
+{stdenvNoCC, darcs, cacert, lib}:
 
+lib.makeOverridable (
 { url
 , rev ? null
 , context ? null
@@ -21,3 +22,4 @@ stdenvNoCC.mkDerivation {
 
   inherit url rev context name;
 }
+)