Problem:

Intermittent "cb() never called!" errors on npm installs for platform.
This is likely due to a race condition on installing OS-specific bits that are built during time of install. When more than one compilation takes place at one time, this error can occur.

Workaround:

Detect the error and re-run the install. (When retrying, one or all of the bits have been compiled. So running it again just finishes the install.)