It does appear to have been the boost install.  I probably didn't `sudo` those in the first attempt.

**Update:** Nope, I got the same build error, eventually.  I'll keep poking at it.
**Update:** I got it to compile on my Raspberry Pi by adding swap:

`sudo dd if=/dev/zero of=/var/swap.img bs=1024k count=2000`
`sudo mkswap /var/swap.img`
`sudo swapon /var/swap.img`