[1] https://github.com/tensorflow/tensorflow/blob/master/tensorflow/g3doc/get_started/os_setup.md
[2] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=782654
On a separate note, this package would be a great candidate for maintenance by the Debian Science Team. I might give it a go if bazel gets uploaded eventually.
Ghis