Please tag a release containing b1b7b60a550361b1727a4b27d66163d8e67cd0cb

[jakepetroules]

Such as 1.4.2. This will ensure dependent projects like swift-build can pull in a tag which contains support for FreeBSD (and OpenBSD). This is blocking swiftlang/swift-build#12

[glessard]

https://github.com/apple/swift-system/releases/tag/1.4.2

$ git tag --contains b1b7b60a550361b1727a4b27d66163d8e67cd0cb
1.4.2