[MacPorts] #62417: llvm-7.0 fails to build on Leopard Intel

[MacPorts]

#62417: llvm-7.0 fails to build on Leopard Intel
--------------------------+--------------------
  Reporter:  Wowfunhappy  |      Owner:  (none)
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.6.4
Resolution:               |   Keywords:
      Port:  llvm-7.0     |
--------------------------+--------------------

Comment (by Wowfunhappy):

 ^ I actually think the first change you suggested fixed it:

 > {{{
 > #if __MAC_OS_X_VERSION_MAX_ALLOWED >= 1060
 > }}}
 >
 > but to be honest, I think it's more reliable if you just use this:
 > {{{
 > #if MAC_OS_X_VERSION_MAX_ALLOWED >= 1060
 > }}}
 >

 Hopefully I'm not speaking to soon, because llvm is still compiling, but
 it usually doesn't go this long before failing. :)

 (I will also make those SDK edits though, it looks super quick/painless.
 If possible, it might be good to put a link to that page in an error
 message for some high-visible port which is known to need them. I don't
 think I would have found it myself.)

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Ticket URL: <https://trac.macports.org/ticket/62417#comment:6>
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