[GRASSLIST:3556] How to import LAEA into lat/lon?

[Terry Duell]

Hullo,
I have been trying to figure out how to import some data which is in Lambert
Azimuthal Equal Area projection, and then reproject into lat/lon.
I thought I had it figured out!
I set up an 'other' location defined with the laea projection, the correct
spheroid, and data extents, etc, but couldn't find a way of defining the
origin. I should point out that the data is in metres and has an origin at
135 00 00E and 15 00 00S. I didn't think any of the standard datums applied
so chose 'datum', thinking that I might then be able to define the datum
lat/lon. Not so.
Anyway, the data was imported into the laea location ok, but when I try to
run r.proj to reproject into a lat/lon location, it fails because there is no
PROJ_INFO file in the laea location.
I guess I need to choose one of the standard datums, but it needs to have the
correct values, ie the origin used to define the laea data I imported. 
Are the data associated with the standard datums documented somewhere within
GRASS?...or am I on the wrong track here?
How do I define the necessary data for the PROJ_INFO file, to take into
account the origin of the imported data, and also account for the units of
measurement used?

Hope someone can help :-)

Cheers,

-- 
Regards,
Terry Duell