diff --git a/temporary/python-packages.nix b/temporary/python-packages.nix
index 8e18a36..91bc7bd 100644
--- a/temporary/python-packages.nix
+++ b/temporary/python-packages.nix
@@ -16,4 +16,29 @@ pkgs: self: super: with self; {
     cudnn = pkgs.cudnn_cudatoolkit90;
     inherit (pkgs.linuxPackages) nvidia_x11;
   };
+
+  # https://github.com/NixOS/nixpkgs/pull/26580 (Cuda definitions are backwards too)
+  libgpuarray = callPackage ./theano-libgpuarray.nix {
+    clblas = pkgs.clblas.override { inherit boost; };
+    cudaSupport = pkgs.config.cudaSupport or false;
+    inherit (pkgs.linuxPackages) nvidia_x11;
+  };
+
+  Theano = callPackage ./theano.nix rec {
+    cudaSupport = pkgs.config.cudaSupport or false;
+    cudnnSupport = cudaSupport;
+    cudatoolkit = pkgs.cudatoolkit8;
+    cudnn = pkgs.cudnn_cudatoolkit8;
+    inherit (pkgs.linuxPackages) nvidia_x11;
+  };
+
+  TheanoWithoutCuda = super.TheanoWithoutCuda.override {
+    cudaSupport = false;
+    cudnnSupport = false;
+  };
+
+  TheanoWithCuda = super.TheanoWithCuda.override {
+    cudaSupport = true;
+    cudnnSupport = true;
+  };
 }
diff --git a/temporary/theano-libgpuarray.nix b/temporary/theano-libgpuarray.nix
new file mode 100644
index 0000000..ef01fde
--- /dev/null
+++ b/temporary/theano-libgpuarray.nix
@@ -0,0 +1,83 @@
+{ stdenv
+, lib
+, buildPythonPackage
+, fetchFromGitHub
+, cmake
+, cython
+, numpy
+, six
+, nose
+, Mako
+, cudaSupport ? false, cudatoolkit , nvidia_x11
+, openclSupport ? true, ocl-icd, clblas
+}:
+
+assert cudaSupport -> nvidia_x11 != null
+                   && cudatoolkit != null;
+
+buildPythonPackage rec {
+  pname = "libgpuarray";
+  version = "0.7.5";
+  name = pname + "-" + version;
+
+  src = fetchFromGitHub {
+    owner = "Theano";
+    repo = "libgpuarray";
+    rev = "v${version}";
+    sha256 = "0zkdwjq3k6ciiyf8y5w663fbsnmzhgy27yvpxfhkpxazw9vg3l5v";
+  };
+
+  # requires a GPU
+  doCheck = false;
+
+  configurePhase = "cmakeConfigurePhase";
+
+  libraryPath = lib.makeLibraryPath (
+    []
+    ++ lib.optionals cudaSupport [ cudatoolkit.lib cudatoolkit.out nvidia_x11 ]
+    ++ lib.optionals openclSupport ([ clblas ] ++ lib.optional (!stdenv.isDarwin) ocl-icd)
+  );
+
+  preBuild = ''
+    make -j$NIX_BUILD_CORES
+    make install
+
+    export NIX_CFLAGS_COMPILE="-L $out/lib -I $out/include $NIX_CFLAGS_COMPILE"
+
+    cd ..
+  '';
+
+  postFixup = ''
+    rm $out/lib/libgpuarray-static.a
+  '' + stdenv.lib.optionalString (!stdenv.isDarwin) ''
+    function fixRunPath {
+      p=$(patchelf --print-rpath $1)
+      patchelf --set-rpath "$p:$libraryPath" $1
+    }
+
+    fixRunPath $out/lib/libgpuarray.so
+  '';
+
+  propagatedBuildInputs = [
+    numpy
+    six
+    Mako
+  ];
+
+  enableParallelBuilding = true;
+
+  buildInputs = [
+    cmake
+    cython
+    nose
+  ];
+
+  meta = with stdenv.lib; {
+    homepage = "https://github.com/Theano/libgpuarray";
+    description = "Library to manipulate tensors on GPU.";
+    license = licenses.free;
+    maintainers = with maintainers; [ artuuge ];
+    platforms = platforms.unix;
+  };
+
+}
diff --git a/temporary/theano.nix b/temporary/theano.nix
new file mode 100644
index 0000000..793488f
--- /dev/null
+++ b/temporary/theano.nix
@@ -0,0 +1,88 @@
+{ stdenv
+, runCommandCC
+, lib
+, fetchPypi
+, gcc
+, buildPythonPackage
+, isPyPy
+, pythonOlder
+, isPy3k
+, nose
+, numpy
+, scipy
+, six
+, libgpuarray
+, cudaSupport ? false, cudatoolkit
+, cudnnSupport ? false, cudnn
+, nvidia_x11
+}:
+
+assert cudnnSupport -> cudaSupport;
+
+assert cudaSupport -> nvidia_x11 != null
+                   && cudatoolkit != null
+                   && cudnn != null;
+
+let
+  wrapped = command: buildTop: buildInputs:
+    runCommandCC "${command}-wrapped" { inherit buildInputs; } ''
+      type -P '${command}' || { echo '${command}: not found'; exit 1; }
+      cat > "$out" <<EOF
+      #!$(type -P bash)
+      $(declare -xp | sed -e '/^[^=]\+="\('"''${NIX_STORE//\//\\/}"'\|[^\/]\)/!d')
+      declare -x NIX_BUILD_TOP="${buildTop}"
+      $(type -P '${command}') "\$@"
+      EOF
+      chmod +x "$out"
+    '';
+
+  # Theano spews warnings and disabled flags if the compiler isn't named g++
+  cxx_compiler = wrapped "g++" "\\$HOME/.theano"
+    (    stdenv.lib.optional cudaSupport libgpuarray_
+      ++ stdenv.lib.optional cudnnSupport cudnn );
+
+  libgpuarray_ = libgpuarray.override { inherit cudaSupport cudatoolkit; };
+
+in buildPythonPackage rec {
+  pname = "Theano";
+  version = "1.0.2";
+
+  disabled = isPyPy || pythonOlder "2.6" || (isPy3k && pythonOlder "3.3");
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "6768e003d328a17011e6fca9126fbb8a6ffd3bb13cb21c450f3e724cca29abde";
+  };
+
+  postPatch = ''
+    substituteInPlace theano/configdefaults.py \
+      --replace 'StrParam(param, is_valid=warn_cxx)' 'StrParam('\'''${cxx_compiler}'\''', is_valid=warn_cxx)' \
+      --replace 'rc == 0 and config.cxx != ""' 'config.cxx != ""'
+  '' + stdenv.lib.optionalString cudaSupport ''
+    substituteInPlace theano/configdefaults.py \
+      --replace 'StrParam(get_cuda_root)' 'StrParam('\'''${cudatoolkit}'\''')'
+  '' + stdenv.lib.optionalString cudnnSupport ''
+    substituteInPlace theano/configdefaults.py \
+      --replace 'StrParam(default_dnn_base_path)' 'StrParam('\'''${cudnn}'\''')'
+  '';
+
+  preCheck = ''
+    mkdir -p check-phase
+    export HOME=$(pwd)/check-phase
+  '';
+  doCheck = false;
+  # takes far too long, also throws "TypeError: sort() missing 1 required positional argument: 'a'"
+  # when run from the installer, and testing with Python 3.5 hits github.com/Theano/Theano/issues/4276,
+  # the fix for which hasn't been merged yet.
+
+  # keep Nose around since running the tests by hand is possible from Python or bash
+  checkInputs = [ nose ];
+  propagatedBuildInputs = [ numpy numpy.blas scipy six libgpuarray_ ];
+
+  meta = with stdenv.lib; {
+    homepage = http://deeplearning.net/software/theano/;
+    description = "A Python library for large-scale array computation";
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ maintainers.bcdarwin ];
+  };
+}