[O] ox-bibtex using the x.bib in different path

[windy]

Hi, everyone,

    I am using org-plus-contrib/ox-bibtex.el to combine bibtex output in html and latex.

    When I use a same x.bib like:

    #+BIBLIOGRAPHY: x unsrturl
    it works well

    But if I use a x.bib at different path and the src like:
    #+BIBLIOGRAPHY: /home/name/dropbox/x unsrturl  or #+BIBLIOGRAPHY: $HOME/dropbox/x unsrturl
    it shows "Executing bibtex2html failed"

    As the link show: http://emacs.stackexchange.com/questions/3375/loading-bibtex-file-in-org-mode-file , we shoud hack the ox-bibtex.el and change the TMPDIR. 

    Is anyone have a hacked ox-bibtex.el or any idea to the problem? I am using the emacs24.4.1 under ubuntu 14.04, the org-mode version is 8.2.10