The following is a post from the ricoh forum on dpreview. (I don't remember who originally posted it.) Anyway, perhaps it can help:
First download the free trial of PlistEdit pro:
Then navigate to here on your Mac:
Copy the Raw.plist file to the desktop in case you mess up (Eoin's advice).
Open "the original file in its original location in PlistEdit Pro. You may have to unlock this file to allow you to save it depending on your security setup. To unlock right click and select get info, go to ownership and permissions and change from read only to read and write". Direct quote from Eoin.
After opening in PlistEdit Pro find the entry for the Panasonic-DMC- LX2 (or LEICA-D-LUX 3)in the upper panel, highlight it and click on duplicate. A new entry is created called Panasonic-DMC- LX2 2 (or LEICA-D-LUX) .I used the plebian Panasonic profile. Click on the name and edit it to read RICOH-Caplio GX100. The name must be entered exactly as I have typed it here. It's probably easiest to cut and paste it. A lot of this is Eoins exact wording but I substituted the correct camera names.
Now just save the edited Raw.plist file in its original location, close all your apps, start up Aperture, and import DNG's directly from your GX100, without the need for any conversion. Again, I have paraphrased Eoin. If you haven't changed your security permissions to read and write, it won't allow you to save.
My only contribution was to find through trial and error the correct name to enter, which again is RICOH-Caplio GX100. Wrong name, won't work. No dash, no caps in correct place, it won't work.