'excutable name of ghostscript.'

@property
def gs_exe(self):

    try:
        return self._cached[u'gs_exe']
    except KeyError:
        pass
    (gs_exe, gs_version) = checkdep_ghostscript()
    if (gs_exe is None):
        gs_exe = u'gs'
    self._cached[u'gs_exe'] = str(gs_exe)
    return str(gs_exe)
