[O] Latex export of longtable with multiline heading

[Simon Guest]

Dear Org-mode people,

I have an Org mode document containing a longtable, which has its
heading row split over two lines.  Exporting this to Latex doesn't work.

Here's a really small example (for which I wouldn't need longtable,
but you get the point):

#+ATTR_LaTeX: longtable align=|r|r|
|-------+---------|
| First |     Age |
| Name  | (years) |
|-------+---------|
| Bob   |       6 |
| Dave  |       7 |
| Wendy |       9 |
|-------+---------|

The PDF document is missing the first line of the header.  Looking at
the Latex file which is generated, there appear to be too many
(i.e. 2) instances of \endhead (but I'm no expert on longtables in
Latex).

It's important that I get this working, or find a work-around.

Any suggestions?

cheers,
Simon