Just skimming the code: LGTM
https://codereview.appspot.com/569540043/diff/555440061/scripts/build/output-distance.py File scripts/build/output-distance.py (right): https://codereview.appspot.com/569540043/diff/555440061/scripts/build/output-distance.py#newcode66 scripts/build/output-distance.py:66: # explicitly use bash, so we don't get dash on Ubuntu. This needs an update of `STEPMAKE_INIT` in `aclocal.m4`. Right now, AFAICS, `bash` is optional, and `configure` falls back to whatever is given in the `SHELL` environment variable. https://codereview.appspot.com/569540043/
