[MacPorts] #66697: doxygen-devel @1.9.6 does not build on macOS High Sierra, Version 10.13.6, because of 'call to unavailable function 'get': introduced in macOS 10.14'?

[MacPorts]

#66697: doxygen-devel @1.9.6 does not build on macOS High Sierra, Version 10.13.6,
because of 'call to unavailable function 'get': introduced in macOS 10.14'?
------------------------+---------------------------
 Reporter:  ballapete   |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.8.0
 Keywords:  highsierra  |       Port:  doxygen-devel
------------------------+---------------------------
 A few times the compiler reports:

 {{{
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports
 .org_macports_release_tarballs_ports_textproc_doxygen-devel/doxygen-
 devel/work/doxygen-1.9.6/src/dispatcher.h:63:34: error: call to
 unavailable function 'get': introduced in macOS 10.14
     std::invoke( W<Alt>::method, std::get<I>( std::forward<V>(v) ),
 std::forward<As>(args)... );
                                  ^~~~~~~~~~~
 }}}

 In the end get:

 {{{
 warning: unknown warning option '-Wno-implicit-int-conversion' [-Wunknown-
 warning-option]
 1 warning and 6 errors generated.
 make[2]: *** [src/CMakeFiles/doxymain.dir/__/generated_src/code.cpp.o]
 Error 1
 make[2]: *** Waiting for unfinished jobs....
 1 warning and 6 errors generated.
 make[2]: ***
 [src/CMakeFiles/doxymain.dir/__/generated_src/fortrancode.cpp.o] Error 1
 1 warning generated.
 1 warning generated.
 1 warning generated.
 1 warning generated.
 1 warning generated.
 1 warning generated.
 make[2]: Leaving directory
 `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports
 .org_macports_release_tarballs_ports_textproc_doxygen-devel/doxygen-
 devel/work/doxygen-1.9.6'
 make[1]: *** [src/CMakeFiles/doxymain.dir/all] Error 2
 make[1]: Leaving directory
 `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports
 .org_macports_release_tarballs_ports_textproc_doxygen-devel/doxygen-
 devel/work/doxygen-1.9.6'
 make: *** [all] Error 2
 make: Leaving directory
 `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports
 .org_macports_release_tarballs_ports_textproc_doxygen-devel/doxygen-
 devel/work/doxygen-1.9.6'
 Command failed:  cd
 "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports
 .org_macports_release_tarballs_ports_textproc_doxygen-devel/doxygen-
 devel/work/doxygen-1.9.6" && /usr/bin/make -j8 -w all VERBOSE=ON
 Exit code: 2
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/66697>
MacPorts <https://www.macports.org/>
Ports system for macOS