[MacPorts] #56411: opencv @3.4.1_2 +python27 fails to build on 10.13.4 HighSierra

[MacPorts]

#56411: opencv @3.4.1_2 +python27 fails to build on 10.13.4 HighSierra
-----------------------+------------------------------
 Reporter:  duchowski  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.4.3
 Keywords:             |       Port:  opencv +python27
-----------------------+------------------------------
 What I really want is opencv +contrib+eigen+python27 but it appears that
 +python27 is what's broken.  Something to do with protobuf?
 From the main.log file:
 {{{
 :info:build 1 error generated.
 :info:build make[2]: ***
 [3rdparty/protobuf/CMakeFiles/libprotobuf.dir/src/google/protobuf/stubs/int128.cc.o]
 Error 1
 :info:build
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_opencv/opencv/work/opencv-3.4.1/3rdparty/protobuf/src/google/protobuf/extension_set.cc:180:48:
 error: no type named 'Arena' in namespace 'google::protobuf'
 }}}
 but that's one excerpt; various errors (over 20) are generated when in
 {{{
 3rdparty/protobuf/CMakeFiles/libprotobuf.dir/src/google/protobuf/
 }}}

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Ticket URL: <https://trac.macports.org/ticket/56411>
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