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-rw-r--r--pkgs/development/libraries/physics/cernlib/default.nix5
1 files changed, 4 insertions, 1 deletions
diff --git a/pkgs/development/libraries/physics/cernlib/default.nix b/pkgs/development/libraries/physics/cernlib/default.nix
index 2a1846e40a6..bd43ae44204 100644
--- a/pkgs/development/libraries/physics/cernlib/default.nix
+++ b/pkgs/development/libraries/physics/cernlib/default.nix
@@ -5,7 +5,10 @@ stdenv.mkDerivation rec {
   pname = "cernlib";
 
   src = fetchurl {
-    url = "https://cernlib.web.cern.ch/cernlib/download/${version}_source/tar/${version}_src.tar.gz";
+    urls = [
+      "https://ftp.riken.jp/cernlib/download/${version}_source/tar/${version}_src.tar.gz"
+      "https://cernlib.web.cern.ch/cernlib/download/${version}_source/tar/${version}_src.tar.gz"
+    ];
     sha256 = "0awla1rl96z82br7slcmg8ks1d2a7slk6dj79ywb871j2ksi3fky";
   };