RaspberryPi/Raspbian has made recent (8/29 - 8/31/12) updates to its installation. These are sudo apt-get upgrade to their 08-16 download.
the SdFatLib library has also been updated.
Arduino's 1.0.1 linux/ARM installation has also been updated.
At any rate, I'm able to successfully install Arduino1.0.1 on the Raspberry, and compile and upload to my Mega2560.
I feel that these issues have been resolved