[MacPorts] #66069: doxygen-1.9.5_0 upgrade failure on 10.13.6

[MacPorts]

#66069: doxygen-1.9.5_0 upgrade failure on 10.13.6
--------------------+---------------------
 Reporter:  rufty   |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.8.0
 Keywords:          |       Port:  doxygen
--------------------+---------------------
 doxygen fails to complete the build on OSX 10.13.6, MP 2.8.0

 :info:build [ 54%] Built target vhdlparser
 :info:build make[1]: Leaving directory
 `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_textproc_doxygen/doxygen/work/doxygen-1.9.5'
 :info:build make: *** [all] Error 2
 :info:build make: Leaving directory
 `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_textproc_doxygen/doxygen/work/doxygen-1.9.5'
 :info:build Command failed:  cd
 "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_textproc_doxygen/doxygen/work/doxygen-1.9.5"
 && /usr/bin/make -j2 -w all VERBOSE=ON
 :info:build Exit code: 2
 :error:build Failed to build doxygen: command execution failed
 :debug:build Error code: CHILDSTATUS 1029 2
 :debug:build Backtrace: command execution failed
 :debug:build     while executing
 :debug:build "system {*}$notty {*}$callback {*}$nice $fullcmdstring"
 :debug:build     invoked from within
 :debug:build "command_exec -callback
 portprogress::target_progress_callback build"
 :debug:build     (procedure "portbuild::build_main" line 8)
 :debug:build     invoked from within
 :debug:build "$procedure $targetname"
 :error:build See
 /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_textproc_doxygen/doxygen/main.log
 for details.

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Ticket URL: <https://trac.macports.org/ticket/66069>
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