Mac OS X disk image is too large (> 40MB)?

Hi,

I made an optimized build on Mac OS X (--disable-debug,
--enable-optimize -disable-test) and then ran

make -C mozilla/xpinstall/packager

The disk image was made successfully, but its size is
over 40MB. It seems to be too large. Shouldn't it at most
around 20MB? It looks like 'stripping' (although it's an optimized) of a
sort was not done. (I saw 'stripping ...' pass by in the screen, though)

What am I missing? I didn't define MOZILLA_OFFICIAL and BUILD_OFFICIAL.
Is it the cause? Do I have to define them. I ran 'make -C ..../packager'
after defining them, but that didn't make any difference in the disk
image size created. So, if I have to, it seems that I have to define
them before beginning 'make -f client.mk build'.

TIA for any help,

Jungshik