Simply. OS X doesn't have wget. It does not come packaged by default. The only way to have wget install on OS X is by using brew or macports. curl is typically included with all distributions and should be used over wget.
This module's documentation makes reference to installing the Android SDK (ADT) on OS X so I would have assumed this was sorted. But even the dependency module maestrodev-wget conditionally doesn't attempt to install wget on OS X (Darwin). Which means this module could never work with OS X.