[MacPorts] #41783: Always use Mac OS X SDK

[MacPorts]

#41783: Always use Mac OS X SDK
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  Reporter:  ryandesign@…  |      Owner:  macports-tickets@…
      Type:  enhancement   |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  base          |    Version:  2.2.99
Resolution:                |   Keywords:
      Port:                |
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Comment (by nad@…):

 This may be a red herring but I believe it is the case that  if
 `-isysroot` is supported by the compiler chain, like Apple's compilers do,
 you can always use just `/` as the SDK path if the system headers have
 been installed by the Command Line Tools.  So you might be able to have it
 both ways: use a real SDK path (like from `xcodebuild -version -sdk macosx
 Path`), when it is available or desired, otherwise just use `/`.

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Ticket URL: <https://trac.macports.org/ticket/41783#comment:12>
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