qt5 fails to build

[db]

On 10.8.5. I don't know if #52922 is related. Should I open a ticket?

Here's the log shortened to its last lines

:info:build /opt/local/bin/clang++-mp-4.0 -c -pipe -arch x86_64 -stdlib=macports-libstdc++ -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk -mmacosx-version-min=10.8 -O2 -std=c++1z -fvisibility=hidden -fvisibility-inlines-hidden -fno-exceptions -Wall -W -Wdate-time -fPIC -DQT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_NO_EVDEV -DQT_NO_TSLIB -DQT_NO_LIBINPUT -DQMEDIA_AVF_CAMERA -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_NO_DEBUG -DQT_NO_KEYWORDS -DQT_PLUGIN -DQT_MULTIMEDIA_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -I. -I../../../../include/QtMultimedia/5.7.1 -I../../../../include/QtMultimedia/5.7.1/QtMultimedia -I../../../../include -I../../../../include/QtMultimedia -I/opt/local/libexec/qt5/lib/QtGui.framework/Headers/5.7.1 -I/opt/local/libexec/qt5/lib/QtGui.framework/Headers/5.7.1/QtGui -I/opt/local/libexec/qt5/lib/QtGui.framework/Headers -I/opt/local/libexec/qt5/lib/QtCore.framework/Headers/5.7.1 -I/opt/local/libexec/qt5/lib/QtCore.framework/Headers/5.7.1/QtCore -I/opt/local/libexec/qt5/lib/QtNetwork.framework/Headers -I/opt/local/libexec/qt5/lib/QtCore.framework/Headers -I.moc -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk/System/Library/Frameworks/OpenGL.framework/Headers -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk/System/Library/Frameworks/AGL.framework/Headers -I/opt/local/libexec/qt5/mkspecs/macx-clang -F/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_aqua_qt5/qt5-qtmultimedia/work/qtmultimedia-opensource-src-5.7.1/lib -F/opt/local/libexec/qt5/lib -o .obj/avfcameraflashcontrol.o avfcameraflashcontrol.mm
:info:build avfcamerautility.mm:555:92: error: property 'firstObject' not found on object of type 'NSArray *'
:info:build         AVFrameRateRange *range = captureDevice.activeFormat.videoSupportedFrameRateRanges.firstObject;
:info:build                                                                                            ^
:info:build 1 error generated.
:info:build make[4]: *** [.obj/avfcamerautility.o] Error 1
:info:build make[4]: *** Waiting for unfinished jobs....
:info:build make[4]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_aqua_qt5/qt5-qtmultimedia/work/qtmultimedia-opensource-src-5.7.1/src/plugins/avfoundation/camera'
:info:build make[3]: *** [sub-camera-make_first] Error 2
:info:build make[3]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_aqua_qt5/qt5-qtmultimedia/work/qtmultimedia-opensource-src-5.7.1/src/plugins/avfoundation'
:info:build make[2]: *** [sub-avfoundation-make_first] Error 2
:info:build make[2]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_aqua_qt5/qt5-qtmultimedia/work/qtmultimedia-opensource-src-5.7.1/src/plugins'
:info:build make[1]: *** [sub-plugins-make_first] Error 2
:info:build make[1]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_aqua_qt5/qt5-qtmultimedia/work/qtmultimedia-opensource-src-5.7.1/src'
:info:build make: *** [sub-src-make_first] Error 2
:info:build make: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_aqua_qt5/qt5-qtmultimedia/work/qtmultimedia-opensource-src-5.7.1'
:info:build Command failed:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_aqua_qt5/qt5-qtmultimedia/work/qtmultimedia-opensource-src-5.7.1" && /usr/bin/make -j2 -w 
:info:build Exit code: 2
:error:build Failed to build qt5-qtmultimedia: command execution failed
:debug:build Error code: CHILDSTATUS 85137 2
:debug:build Backtrace: command execution failed
:debug:build     while executing
:debug:build "system {*}$notty {*}$nice $fullcmdstring"
:debug:build     invoked from within
:debug:build "command_exec build"
:debug:build     (procedure "portbuild::build_main" line 8)
:debug:build     invoked from within
:debug:build "$procedure $targetname"
:debug:build Registry error: qt55-qtbase not registered as installed & active.
:error:build See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_aqua_qt5/qt5-qtmultimedia/main.log for details.