diff --git a/pkgs/development/libraries/acl/default.nix b/pkgs/development/libraries/acl/default.nix
index 342c07a1b3e..81e2c77ee96 100644
--- a/pkgs/development/libraries/acl/default.nix
+++ b/pkgs/development/libraries/acl/default.nix
@@ -4,9 +4,7 @@ stdenv.mkDerivation {
   name = "acl-2.2.47";
 
   src = fetchurl {
-    # The file cannot be downloaded from sgi.com.
-    #url = ftp://oss.sgi.com/projects/xfs/cmd_tars/acl_2.2.47-1.tar.gz;
-    url = "http://gentoo.chem.wisc.edu/gentoo/distfiles/acl_2.2.47-1.tar.gz";
+    url = http://nixos.org/tarballs/acl_2.2.47-1.tar.gz;
     sha256 = "1j39g62fki0iyji9s62slgwdfskpkqy7rmjlqcnmsvsnxbxhc294";
   };
 
diff --git a/pkgs/development/libraries/attr/default.nix b/pkgs/development/libraries/attr/default.nix
index 5b8aa839cf8..af15829dad9 100644
--- a/pkgs/development/libraries/attr/default.nix
+++ b/pkgs/development/libraries/attr/default.nix
@@ -4,9 +4,7 @@ stdenv.mkDerivation {
   name = "attr-2.4.41";
 
   src = fetchurl {
-    # The file cannot be downloaded from sgi.com.
-    #url = ftp://oss.sgi.com/projects/xfs/cmd_tars/attr_2.4.41-1.tar.gz;
-    url = "http://gentoo.chem.wisc.edu/gentoo/distfiles/attr_2.4.41-1.tar.gz";
+    url = http://nixos.org/tarballs/attr_2.4.41-1.tar.gz;
     sha256 = "0dc286g8vr402aca6wg945sdm92bys8a142vrkwx6bkjz4bwz6gp";
   };