[MacPorts] #56082: libsdl2 @2.0.8: error: unrecognized platform name macOS

[MacPorts]

#56082: libsdl2 @2.0.8: error: unrecognized platform name macOS
------------------------+------------------------
  Reporter:  adamb2903  |      Owner:  jmroot
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:  highsierra
      Port:  libsdl2    |
------------------------+------------------------

Comment (by jmroot):

 That's about it for external factors then. We could compare toolchain
 versions in more detail I guess?
 {{{
 % xcode-select -print-path
 /Applications/Xcode.app/Contents/Developer
 % xcodebuild -version
 Xcode 9.3
 Build version 9E145
 % /usr/bin/clang -v
 Apple LLVM version 9.1.0 (clang-902.0.39.1)
 Target: x86_64-apple-darwin17.5.0
 Thread model: posix
 InstalledDir:
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
 }}}

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Ticket URL: <https://trac.macports.org/ticket/56082#comment:15>
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