From 57f1baa66d2317eca74cc858507ffe7f4c39ebdc Mon Sep 17 00:00:00 2001
From: Justin Bedo <cu@cua0.org>
Date: Tue, 8 Jul 2014 11:02:05 +1000
Subject: [PATCH] Added CRAN archive to R package derivation to prevent R
 expressions from breaking when any package is updated.

---
 pkgs/development/r-modules/cran-packages.nix | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/r-modules/cran-packages.nix b/pkgs/development/r-modules/cran-packages.nix
index 3bebd5468e9..3a8624c9493 100644
--- a/pkgs/development/r-modules/cran-packages.nix
+++ b/pkgs/development/r-modules/cran-packages.nix
@@ -44,7 +44,10 @@ let
   derive = { name, version, sha256, depends ? [] }: buildRPackage {
     name = "${name}-${version}";
     src = fetchurl {
-      url = "mirror://cran/src/contrib/${name}_${version}.tar.gz";
+      urls = [
+        "mirror://cran/src/contrib/${name}_${version}.tar.gz"
+        "mirror://cran/src/contrib/Archive/${name}/${name}_${version}.tar.gz"
+      ];
       inherit sha256;
     };
     propagatedBuildInputs = depends;