[MacPorts] #65314: doxygen @1.9.4: fatal error: 'variant' file not found fatal error: 'variant' file not found

[MacPorts]

#65314: doxygen @1.9.4: fatal error: 'variant' file not found fatal error:
'variant' file not found
------------------------+---------------------
 Reporter:  ryandesign  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  High        |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  doxygen
------------------------+---------------------
 doxygen fails to build on 10.13 and earlier:
 https://build.macports.org/builders/ports-10.13_x86_64-builder/builds/153600/steps
 /install-port/logs/stdio
 {{{

 In file included from
 /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_textproc_doxygen/doxygen/work/doxygen-1.9.4/src/code.l:52:
 In file included from
 /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_textproc_doxygen/doxygen/work/doxygen-1.9.4/src/outputlist.h:25:
 /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_textproc_doxygen/doxygen/work/doxygen-1.9.4/src/searchindex.h:29:10:
 fatal error: 'variant' file not found
 #include <variant>
          ^~~~~~~~~
 }}}

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Ticket URL: <https://trac.macports.org/ticket/65314>
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