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wahern
Oh, the horror!

  import SwiftPrivateLibcExtras
  #if os(OSX) || os(iOS)
  import Darwin
 -#elseif os(Linux) || os(FreeBSD) || os(PS4) || os(Android) || os(Cygwin) || os(Haiku)
 +#elseif os(Linux) || os(FreeBSD) || os(PS4) || os(Android) || os(Cygwin) || os(Fuchsia) || os(Haiku)
  import Glibc
  #endif
(NOTE: Not the macros, but the apparent decision of early Swift developers to divide the world into two camps: OS X and Linux. Moreover, glibc is conflated with Linux. Worse, glibc is the de facto portability layer. I want to cry....)
waddlesplash
Well ... Haiku isn't exactly glibc. Our math and IO portions are indeed glibc at least in large part (although a very old version...) but there is also a large chunk (locale, wchar_t, etc.) which we have our own version of.