[MacPorts] #72150: clang-20 failed to build on < 10.14

[MacPorts]

#72150: clang-20 failed to build on < 10.14
-------------------------------+--------------------------
  Reporter:  jmroot            |      Owner:  cjones051073
      Type:  defect            |     Status:  closed
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:
Resolution:  fixed             |   Keywords:
      Port:  clang-20 llvm-20  |
-------------------------------+--------------------------

Comment (by jmroot):

 There was a different error with clang-14.
 {{{
 /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_lang_llvm-20/flang-20/work
 /llvm-project-20.1.0.src/flang/runtime/time-intrinsic.cpp:148:28: error:
 use of undeclared identifier 'TIME_UTC'
   if (timespec_get(&tspec, TIME_UTC) < 0) {
                            ^
 }}}
 https://build.macports.org/builders/ports-10.15_x86_64-builder/builds/207211/steps
 /install-port/logs/stdio

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Ticket URL: <https://trac.macports.org/ticket/72150#comment:6>
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