3. (not) Building Swift
(The I've-just-got-30-minutes way)
$ http://swift-arm.ddns.net/job/Swift-3.0-Pi3-ARM-Incremental/
lastSuccessfulBuild/artifact/
swift-3.0-2016-12-21-RPi23-ubuntu16.04.tar.gz
or
$ wget https://www.dropbox.com/s/cah35gf5ap22d11/swift-3.0.2-RPi23-1604.tgz
Courtesy of @uraimo