unable to locate HDF5 header file at hdf5.h

Hello:
I am using torch to run nerual talk2 , but when I run the eval.lua I got this error :

```
/home/dmt/torch/install/share/lua/5.1/trepl/init.lua:384: /home/dmt/torch/install/share/lua/5.1/trepl/init.lua:384: /home/dmt/torch/install/share/lua/5.1/hdf5/ffi.lua:42: Error: unable to locate HDF5 header file at hdf5.h
stack traceback:
[C]: in function 'error'
/home/dmt/torch/install/share/lua/5.1/trepl/init.lua:384: in function 'require'
eval.lua:8: in main chunk
[C]: in function 'dofile'
.../dmt/torch/install/lib/luarocks/rocks/trepl/scm-1/bin/th:145: in main chunk
[C]: at 0x00406670
```

I am using Ubuntu 14 and I have done follows as [https://github.com/deepmind/torch-hdf5/blob/master/doc/usage.md](url)

Ubuntu >= 13.04
sudo apt-get install libhdf5-serial-dev hdf5-tools
git clone git@github.com:deepmind/torch-hdf5.git
cd torch-hdf5
luarocks make hdf5-0-0.rockspec LIBHDF5_LIBDIR="/usr/lib/x86_64-linux-gnu/"

I don't know what is the problem .

Start with the reported failure at hdf5/ffi.lua:42 and compare the installation steps in doc/usage.md with the hdf5-0-0.rockspec command and its LIBHDF5_LIBDIR setting. Reproduce the eval.lua failure on the stated Ubuntu setup, then document the configuration or installation change that lets the HDF5 header be located.

Written by the indexing model from the issue text.