Build tensorflow from source

build_tensorflow.sh

#Install Cuda V7.0 (!!!) and Cudnn 6.5

# https://developer.nvidia.com/cuda-toolkit-70

wget http://developer.download.nvidia.com/compute/cuda/7_0/Prod/local_installers/rpmdeb/cuda-repo-ubuntu1404-7-0-local_7.0-28_amd64.deb
 sudo dpkg -i 
sudo apt-get update
sudo apt-get install cuda=7.0-28 

wget https://s3-eu-west-1.amazonaws.com/christopherbourez/public/cudnn-6.5-linux-x64-v2.tgz
tar cudnn-6.5-linux-x64-v2.tgz
rm xvzf cudnn-6.5-linux-x64-v2.tgz
sudo cp cudnn-6.5-linux-x64-v2/cudnn.h /usr/local/cuda-7.5/include/
sudo cp cudnn-6.5-linux-x64-v2/libcudnn* /usr/local/cuda-7.5/lib64/

git clone --recurse-submodules https://github.com/tensorflow/tensorflow
sudo apt-get install python-numpy swig python-dev

cd tensorflow
./configure

# get and install bazel (http://bazel.io/docs/install.html)
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer
sudo apt-get install oracle-java8-set-default
sudo apt-get install pkg-config zip g++ zlib1g-dev unzip
wget https://github.com/bazelbuild/bazel/releases/download/0.1.1/bazel-0.1.1-installer-linux-x86_64.sh
chmod +x bazel-0.1.1-installer-linux-x86_64.sh
export JAVA_HOME=/usr/lib/jvm/java-8-oracle
./bazel-0.1.1-installer-linux-x86_64.sh --user
# add /home/<username>/bin to $PATH

bazel build -c opt --config=cuda //tensorflow/cc:tutorials_example_trainer

https://github.com/bazelbuild/bazel/releases/tag/0.1.1

I had to create a broken cuda.config before tensorflow/configure would work. For completedness, I put

CUDA_TOOLKIT_PATH="/usr/local/cuda-7.0"
CUDNN_INSTALL_PATH="/usr/local/cuda-6.5"

In there before it replaced it with something useful.