conda build can no longer find binstar

I thought I opened an issue for this, but I couldn't find it. `conda build` no uploads to binstar. It just says

```
Error: cannot locate binstar (required for upload)
# Try:
# $ conda install binstar
```

This is because I don't have binstar installed in my root environment (because it doesn't support Python 3). `find_executable` only searches the root dir, the build dir, and `/usr/bin` and so on on unix, instead of searching PATH.  Is there a good reason for this?