The reason that I piped STDERR to /dev/null (and the true command) was to make sure that the Makefile worked on Mac and Linux (which is definitely hacky).

It felt weird doing a Windows check in this part of the Makefile, but it also seemed like it would be inappropriate to copy the AdbWin* binaries to the right spot in _addon/data_ in any Makefile other than this one. What do you think is the best way to handle this?