1 files changed, 6 insertions, 3 deletions
diff --git a/pkgs/build-support/fetchdarcs/default.nix b/pkgs/build-support/fetchdarcs/default.nix
index 3c2e0524eea..2644a20d0a5 100644
--- a/pkgs/build-support/fetchdarcs/default.nix
+++ b/pkgs/build-support/fetchdarcs/default.nix
@@ -1,13 +1,16 @@
 {stdenv, darcs, nix}: {url, rev ? null, context ? null, md5 ? "", sha256 ? ""}:
 
+if md5 != "" then
+  throw "fetchdarcs does not support md5 anymore, please use sha256"
+else
 stdenv.mkDerivation {
   name = "fetchdarcs";
   builder = ./builder.sh;
   buildInputs = [darcs];
 
-  outputHashAlgo = if sha256 == "" then "md5" else "sha256";
+  outputHashAlgo = "sha256";
   outputHashMode = "recursive";
-  outputHash = if sha256 == "" then md5 else sha256;
-  
+  outputHash = sha256;
+
   inherit url rev context;
 }