[MacPorts] #69975: re2 @2024-04-01_2: fails to build on macOS 10.12/Xcode 9.2 due to <optional> not found in abseil headers

[MacPorts]

#69975: re2 @2024-04-01_2: fails to build on macOS 10.12/Xcode 9.2 due to
<optional> not found in abseil headers
----------------------+-------------------------
  Reporter:  andlabs  |      Owner:  herbygillot
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.9.3
Resolution:           |   Keywords:
      Port:  re2      |
----------------------+-------------------------

Comment (by FlyingSamson):

 I'm no expert with this, but could this be solved by changing
 {{{
 compiler.blacklist-append \
                     {clang < 900}
 }}}
 to
 {{{
 compiler.blacklist-append \
                     {clang < 1000}
 }}}
 ?

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Ticket URL: <https://trac.macports.org/ticket/69975#comment:7>
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