If it's really a memory problem, you can try enabling swap temporarly (you need to have run Yun http://arduino.cc/en/Tutorial/ExpandingYunDiskSpace )
opkg install swap-utils
dd if=/dev/zero of=/swapfile bs=1024 count=65536 # Create a 64MB swap file at /swapfile
mkswap /swapfile
swapon /swapfile