This is a NaCl port of DROD: Gunthro and the Epic Blunder. See readme.DROD.txt for more info.
You'll probably need linux (or something linux-like).
# Find a good place to put drod-nacl
$ git clone git://github.com/binji/drod-nacl
$ cd drod-nacl
$ git submodule init
$ git submodule update
First build the necessary libraries. You should only have to do this once.
$ make ports
Now build DROD.
$ make
The output is put in $PWD/out. The data needed for the package is in $PWD/out/package.
$ export CHROME_PATH=/path/to/chrome
$ make run-package