To build it on Ubuntu 13.04 (and I think other, you also need to install ncurses - see http://www.cyberciti.biz/faq/linux-error-cursesh-no-such-file-directory/
And you need to add the following line to Makefile.local.mk:
LDFLAGS += -pthread
Then it builds with Wunused-parameter and Wunused-but-set-variable warnings.
Same for Debian Sid.
probably related to http://askubuntu.com/questions/376204/bochs-compiling-error-again