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+# Release 1.11 (2016-01-19)
+
+This is primarily a bug fix release. It also has a number of new
+features:
+
+  - `nix-prefetch-url` can now download URLs specified in a Nix
+    expression. For example,
+    
+        $ nix-prefetch-url -A hello.src
+    
+    will prefetch the file specified by the `fetchurl` call in the
+    attribute `hello.src` from the Nix expression in the current
+    directory, and print the cryptographic hash of the resulting file on
+    stdout. This differs from `nix-build -A
+                    hello.src` in that it doesn't verify the hash, and is thus useful
+    when you’re updating a Nix expression.
+    
+    You can also prefetch the result of functions that unpack a tarball,
+    such as `fetchFromGitHub`. For example:
+    
+        $ nix-prefetch-url --unpack https://github.com/NixOS/patchelf/archive/0.8.tar.gz
+    
+    or from a Nix expression:
+    
+        $ nix-prefetch-url -A nix-repl.src
+
+  - The builtin function `<nix/fetchurl.nix>` now supports downloading
+    and unpacking NARs. This removes the need to have multiple downloads
+    in the Nixpkgs stdenv bootstrap process (like a separate busybox
+    binary for Linux, or curl/mkdir/sh/bzip2 for Darwin). Now all those
+    files can be combined into a single NAR, optionally compressed using
+    `xz`.
+
+  - Nix now supports SHA-512 hashes for verifying fixed-output
+    derivations, and in `builtins.hashString`.
+
+  - The new flag `--option build-repeat
+                            N` will cause every build to be executed N+1 times. If the build
+    output differs between any round, the build is rejected, and the
+    output paths are not registered as valid. This is primarily useful
+    to verify build determinism. (We already had a `--check` option to
+    repeat a previously succeeded build. However, with `--check`,
+    non-deterministic builds are registered in the DB. Preventing that
+    is useful for Hydra to ensure that non-deterministic builds don't
+    end up getting published to the binary cache.)
+
+  - The options `--check` and `--option
+                            build-repeat N`, if they detect a difference between two runs of the
+    same derivation and `-K` is given, will make the output of the other
+    run available under `store-path-check`. This makes it easier to
+    investigate the non-determinism using tools like `diffoscope`, e.g.,
+    
+        $ nix-build pkgs/stdenv/linux -A stage1.pkgs.zlib --check -K
+        error: derivation ‘/nix/store/l54i8wlw2265…-zlib-1.2.8.drv’ may not
+        be deterministic: output ‘/nix/store/11a27shh6n2i…-zlib-1.2.8’
+        differs from ‘/nix/store/11a27shh6n2i…-zlib-1.2.8-check’
+        
+        $ diffoscope /nix/store/11a27shh6n2i…-zlib-1.2.8 /nix/store/11a27shh6n2i…-zlib-1.2.8-check
+        …
+        ├── lib/libz.a
+        │   ├── metadata
+        │   │ @@ -1,15 +1,15 @@
+        │   │ -rw-r--r-- 30001/30000   3096 Jan 12 15:20 2016 adler32.o
+        …
+        │   │ +rw-r--r-- 30001/30000   3096 Jan 12 15:28 2016 adler32.o
+        …
+
+  - Improved FreeBSD support.
+
+  - `nix-env -qa --xml --meta` now prints license information.
+
+  - The maximum number of parallel TCP connections that the binary cache
+    substituter will use has been decreased from 150 to 25. This should
+    prevent upsetting some broken NAT routers, and also improves
+    performance.
+
+  - All "chroot"-containing strings got renamed to "sandbox". In
+    particular, some Nix options got renamed, but the old names are
+    still accepted as lower-priority aliases.
+
+This release has contributions from Anders Claesson, Anthony Cowley,
+Bjørn Forsman, Brian McKenna, Danny Wilson, davidak, Eelco Dolstra,
+Fabian Schmitthenner, FrankHB, Ilya Novoselov, janus, Jim Garrison, John
+Ericson, Jude Taylor, Ludovic Courtès, Manuel Jacob, Mathnerd314, Pascal
+Wittmann, Peter Simons, Philip Potter, Preston Bennes, Rommel M.
+Martinez, Sander van der Burg, Shea Levy, Tim Cuthbertson, Tuomas
+Tynkkynen, Utku Demir and Vladimír Čunát.