From 9e95109b89fa575e3c6f187aab10b250dc59e330 Mon Sep 17 00:00:00 2001
From: Timo Kaufmann <timokau@zoho.com>
Date: Mon, 4 Mar 2019 14:08:55 +0100
Subject: [PATCH 1/2] pythonPackages.tensorflow-tensorboard: fix python2 build

Fix build after https://github.com/NixOS/nixpkgs/pull/56669. Update the
python2 hash and re-add the python2 `futures` dependency. Not sure if
there was a reason for it to be removed in the first place.
---
 .../tensorflow-tensorboard/default.nix               | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/pkgs/development/python-modules/tensorflow-tensorboard/default.nix b/pkgs/development/python-modules/tensorflow-tensorboard/default.nix
index b196fc8edce6..7840e6de0092 100644
--- a/pkgs/development/python-modules/tensorflow-tensorboard/default.nix
+++ b/pkgs/development/python-modules/tensorflow-tensorboard/default.nix
@@ -26,12 +26,16 @@ buildPythonPackage rec {
     sha256 = "19ixs811ndx8qh72dif0ywjss3rv7pf1khsgg6rvfjb9nw8wgjc2";
   } else {
     python = "py2";
-    sha256 = "1mkyb5gn952i4s7fmc9ay4yh74ysrqbiqna6dl1qmahjpbaavbf5";
+    sha256 = "0qpv6jsf6jjvdl95qvarn006kfj5a99mq925d73xg4af50ssvkrf";
   }));
 
-  propagatedBuildInputs = [ numpy werkzeug protobuf
-                            markdown
-                            grpcio absl-py ]; # ++ lib.optional (!isPy3k) futures;
+  propagatedBuildInputs = [
+    numpy
+    werkzeug
+    protobuf
+    markdown
+    grpcio absl-py
+  ] ++ lib.optional (!isPy3k) futures;
 
   meta = with stdenv.lib; {
     description = "TensorFlow's Visualization Toolkit";

From af7455b1c80cf81b98f8a205bf6d16c44518ea55 Mon Sep 17 00:00:00 2001
From: Timo Kaufmann <timokau@zoho.com>
Date: Mon, 4 Mar 2019 14:10:28 +0100
Subject: [PATCH 2/2] pythonPackages.tensorflow: fix python<3.4 build

This was already added for the source build, but missing for the binary
build.
---
 pkgs/development/python-modules/tensorflow/bin.nix | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/python-modules/tensorflow/bin.nix b/pkgs/development/python-modules/tensorflow/bin.nix
index e1c25d9eca71..03f1e66bf501 100644
--- a/pkgs/development/python-modules/tensorflow/bin.nix
+++ b/pkgs/development/python-modules/tensorflow/bin.nix
@@ -55,7 +55,8 @@ in buildPythonPackage rec {
   in fetchurl dls.${key};
 
   propagatedBuildInputs = [  protobuf numpy termcolor grpcio six astor absl-py gast tensorflow-estimator tensorflow-tensorboard keras-applications keras-preprocessing ]
-                 ++ lib.optional (!isPy3k) mock;
+                 ++ lib.optional (!isPy3k) mock
+                 ++ lib.optionals (pythonOlder "3.4") [ backports_weakref ];
 
   # Upstream has a pip hack that results in bin/tensorboard being in both tensorflow
   # and the propageted input tensorflow-tensorboard which causes environment collisions.