qt4-mac upgrade from 4.6.2_1 to 4.6.2_2 fails when conflicting ports are active

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:info:build make[2]: *** [obj/release/ClipboardQt.o] Error 1
:info:build make[1]: *** [release-all] Error 2
:info:build make[1]: *** Waiting for unfinished jobs....
:info:build /usr/bin/g++-4.2 -c -include .pch/debug-shared/QtWebKit_debug -pipe -Wreturn-type -fno-strict-aliasing -fconstant-cfstrings -I/opt/local/include -gdwarf-2 -arch x86_64 -Xarch_x86_64 -mmacosx-version-min=10.5 -fvisibility=hidden -fvisibility-inlines-hidden -Wall -W -fPIC -DQT_SHARED -DBUILDING_QT__=1 -DQT_NO_CAST_TO_ASCII -DQT_ASCII_CAST_WARNINGS -DQT3_SUPPORT -DQT_MOC_COMPAT -DNDEBUG -DBUILD_WEBKIT -DENABLE_JAVASCRIPT_DEBUGGER=1 -DENABLE_DATABASE=1 -DENABLE_EVENTSOURCE=1 -DENABLE_OFFLINE_WEB_APPLICATIONS=1 -DENABLE_DOM_STORAGE=1 -DENABLE_ICONDATABASE=1 -DENABLE_CHANNEL_MESSAGING=1 -DENABLE_ORIENTATION_EVENTS=0 -DENABLE_SQLITE=1 -DENABLE_DASHBOARD_SUPPORT=0 -DENABLE_FILTERS=0 -DENABLE_XPATH=1 -DENABLE_WCSS=0 -DENABLE_WML=0 -DENABLE_SHARED_WORKERS=1 -DENABLE_WORKERS=1 -DENABLE_XHTMLMP=0 -DENABLE_DATAGRID=0 -DENABLE_SVG=1 -DENABLE_SVG_FONTS=1 -DENABLE_SVG_FOREIGN_OBJECT=1 -DENABLE_SVG_ANIMATION=1 -DENABLE_SVG_AS_IMAGE=1 -DENABLE_SVG_USE=1 -DENABLE_RUBY=1 -DENABLE_VIDEO=1 -DENABLE_DATALIST=1 -DENABLE_NETSCAPE_PLUGIN_API=1 -DENABLE_WEB_SOCKETS=0 -DENABLE_XSLT=1 -DWTF_USE_JAVASCRIPTCORE_BINDINGS=1 -DWTF_CHANGES=1 -DBUILDING_QT__ -DBUILDING_JavaScriptCore -DBUILDING_WTF -DQT_XMLPATTERNS_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I../../../../mkspecs/macx-g++ -I. -I../../../../include/QtCore -I../../../../include/QtNetwork -I../../../../include/QtGui -I../../../../include/QtXmlPatterns -I../../../../include -Ibridge/qt -Ipage/qt -Iplatform/graphics/qt -Iplatform/network/qt -Iplatform/qt -I../WebKit/qt/WebCoreSupport -I. -Iaccessibility -Ibindings/js -Ibridge -Ibridge/c -Icss -Idom -Idom/default -Iediting -Ihistory -Ihtml -Ihtml/canvas -Iinspector -Iloader -Iloader/appcache -Iloader/archive -Iloader/icon -Inotifications -Ipage -Ipage/animation -Iplatform -Iplatform/animation -Iplatform/graphics -Iplatform/graphics/filters -Iplatform/graphics/transforms -Iplatform/image-decoders -Iplatform/mock -Iplatform/network -Iplatform/sql -Iplatform/text -Iplugins -Irendering -Irendering/style -Istorage -Isvg -Isvg/animation -Isvg/graphics -Isvg/graphics/filters -Iwebsockets -Iwml -Iworkers -Ixml -Igenerated -I../JavaScriptCore -I../../webkit -I../JavaScriptCore/assembler -I../JavaScriptCore/bytecode -I../JavaScriptCore/bytecompiler -I../JavaScriptCore/debugger -I../JavaScriptCore/interpreter -I../JavaScriptCore/jit -I../JavaScriptCore/parser -I../JavaScriptCore/profiler -I../JavaScriptCore/runtime -I../JavaScriptCore/wrec -I../JavaScriptCore/wtf -I../JavaScriptCore/wtf/unicode -I../JavaScriptCore/yarr -I../JavaScriptCore/API -I../JavaScriptCore/ForwardingHeaders -Igenerated -I../WebKit/qt/Api -I../../../../include/QtWebKit -I.rcc/debug-shared -I../JavaScriptCore/pcre -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_aqua_qt4-mac/work/qt-everywhere-opensource-src-4.6.2/src/3rdparty/webkit/WebKitBuild/Debug/JavaScriptCore/tmp -Iplatform/mac -I../../../../include/phonon -I../../../../lib/phonon.framework/Versions/4/Headers -I.moc/debug-shared -F/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_aqua_qt4-mac/work/qt-everywhere-opensource-src-4.6.2/lib -o obj/debug/ContextMenuItemQt.o platform/qt/ContextMenuItemQt.cpp
:info:build /usr/bin/g++-4.2 -c -include .pch/debug-shared/QtWebKit_debug -pipe -Wreturn-type -fno-strict-aliasing -fconstant-cfstrings -I/opt/local/include -gdwarf-2 -arch x86_64 -Xarch_x86_64 -mmacosx-version-min=10.5 -fvisibility=hidden -fvisibility-inlines-hidden -Wall -W -fPIC -DQT_SHARED -DBUILDING_QT__=1 -DQT_NO_CAST_TO_ASCII -DQT_ASCII_CAST_WARNINGS -DQT3_SUPPORT -DQT_MOC_COMPAT -DNDEBUG -DBUILD_WEBKIT -DENABLE_JAVASCRIPT_DEBUGGER=1 -DENABLE_DATABASE=1 -DENABLE_EVENTSOURCE=1 -DENABLE_OFFLINE_WEB_APPLICATIONS=1 -DENABLE_DOM_STORAGE=1 -DENABLE_ICONDATABASE=1 -DENABLE_CHANNEL_MESSAGING=1 -DENABLE_ORIENTATION_EVENTS=0 -DENABLE_SQLITE=1 -DENABLE_DASHBOARD_SUPPORT=0 -DENABLE_FILTERS=0 -DENABLE_XPATH=1 -DENABLE_WCSS=0 -DENABLE_WML=0 -DENABLE_SHARED_WORKERS=1 -DENABLE_WORKERS=1 -DENABLE_XHTMLMP=0 -DENABLE_DATAGRID=0 -DENABLE_SVG=1 -DENABLE_SVG_FONTS=1 -DENABLE_SVG_FOREIGN_OBJECT=1 -DENABLE_SVG_ANIMATION=1 -DENABLE_SVG_AS_IMAGE=1 -DENABLE_SVG_USE=1 -DENABLE_RUBY=1 -DENABLE_VIDEO=1 -DENABLE_DATALIST=1 -DENABLE_NETSCAPE_PLUGIN_API=1 -DENABLE_WEB_SOCKETS=0 -DENABLE_XSLT=1 -DWTF_USE_JAVASCRIPTCORE_BINDINGS=1 -DWTF_CHANGES=1 -DBUILDING_QT__ -DBUILDING_JavaScriptCore -DBUILDING_WTF -DQT_XMLPATTERNS_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I../../../../mkspecs/macx-g++ -I. -I../../../../include/QtCore -I../../../../include/QtNetwork -I../../../../include/QtGui -I../../../../include/QtXmlPatterns -I../../../../include -Ibridge/qt -Ipage/qt -Iplatform/graphics/qt -Iplatform/network/qt -Iplatform/qt -I../WebKit/qt/WebCoreSupport -I. -Iaccessibility -Ibindings/js -Ibridge -Ibridge/c -Icss -Idom -Idom/default -Iediting -Ihistory -Ihtml -Ihtml/canvas -Iinspector -Iloader -Iloader/appcache -Iloader/archive -Iloader/icon -Inotifications -Ipage -Ipage/animation -Iplatform -Iplatform/animation -Iplatform/graphics -Iplatform/graphics/filters -Iplatform/graphics/transforms -Iplatform/image-decoders -Iplatform/mock -Iplatform/network -Iplatform/sql -Iplatform/text -Iplugins -Irendering -Irendering/style -Istorage -Isvg -Isvg/animation -Isvg/graphics -Isvg/graphics/filters -Iwebsockets -Iwml -Iworkers -Ixml -Igenerated -I../JavaScriptCore -I../../webkit -I../JavaScriptCore/assembler -I../JavaScriptCore/bytecode -I../JavaScriptCore/bytecompiler -I../JavaScriptCore/debugger -I../JavaScriptCore/interpreter -I../JavaScriptCore/jit -I../JavaScriptCore/parser -I../JavaScriptCore/profiler -I../JavaScriptCore/runtime -I../JavaScriptCore/wrec -I../JavaScriptCore/wtf -I../JavaScriptCore/wtf/unicode -I../JavaScriptCore/yarr -I../JavaScriptCore/API -I../JavaScriptCore/ForwardingHeaders -Igenerated -I../WebKit/qt/Api -I../../../../include/QtWebKit -I.rcc/debug-shared -I../JavaScriptCore/pcre -I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_aqua_qt4-mac/work/qt-everywhere-opensource-src-4.6.2/src/3rdparty/webkit/WebKitBuild/Debug/JavaScriptCore/tmp -Iplatform/mac -I../../../../include/phonon -I../../../../lib/phonon.framework/Versions/4/Headers -I.moc/debug-shared -F/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_aqua_qt4-mac/work/qt-everywhere-opensource-src-4.6.2/lib -o obj/debug/ContextMenuQt.o platform/qt/ContextMenuQt.cpp
:info:build make[2]: *** [obj/debug/ClipboardQt.o] Error 1
:info:build make[2]: *** Waiting for unfinished jobs....
:info:build In file included from platform/network/qt/ResourceResponse.h:29,
:info:build                  from loader/CachedResource.h:28,
:info:build                  from loader/CachedResourceHandle.h:29,
:info:build                  from dom/Document.h:29,
:info:build                  from platform/qt/ContextMenuQt.cpp:34:
:info:build platform/network/ResourceResponseBase.h:118: error: field 'm_url' has incomplete type
:info:build platform/network/ResourceResponseBase.h:154: error: field 'm_url' has incomplete type
:info:build make[2]: *** [obj/debug/ContextMenuQt.o] Error 1
:info:build make[1]: *** [debug-all] Error 2
:info:build make: *** [sub-webkit-make_default-ordered] Error 2
:info:build shell command " cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_aqua_qt4-mac/work/qt-everywhere-opensource-src-4.6.2" && /usr/bin/make -j2 first " returned error 2
:error:build Target org.macports.build returned: shell command failed
:debug:build Backtrace: shell command failed
    while executing
"command_exec build"
    (procedure "portbuild::build_main" line 8)
    invoked from within
"$procedure $targetname"
:info:build Warning: the following items did not execute (for qt4-mac): org.macports.destroot org.macports.build
:notice:build Log for qt4-mac is at: /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_ports_aqua_qt4-mac/main.log

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/opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_ports_aqua_qt4-mac/main.log

[ryandesign (Ryan Carsten Schmidt)]

The relevant first error appears to be

:info:build In file included from platform/network/qt/ResourceResponse.h:29,
:info:build                  from loader/CachedResource.h:28,
:info:build                  from loader/CachedResourceHandle.h:29,
:info:build                  from dom/Clipboard.h:27,
:info:build                  from platform/qt/ClipboardQt.h:29,
:info:build                  from platform/qt/ClipboardQt.cpp:29:
:info:build platform/network/ResourceResponseBase.h:51: error: ISO C++ forbids declaration of 'KURL' with no type
:info:build platform/network/ResourceResponseBase.h:51: error: expected ';' before '&' token
:info:build platform/network/ResourceResponseBase.h:52: error: expected ',' or '...' before '&' token
:info:build platform/network/ResourceResponseBase.h:52: error: ISO C++ forbids declaration of 'KURL' with no type
:info:build platform/network/ResourceResponseBase.h:108: error: expected ',' or '...' before '&' token
:info:build platform/network/ResourceResponseBase.h:108: error: ISO C++ forbids declaration of 'KURL' with no type
:info:build platform/network/ResourceResponseBase.h:118: error: 'KURL' does not name a type
:info:build platform/network/ResourceResponseBase.h:154: error: 'KURL' does not name a type

So this is a duplicate of #20199. Deactivate any of the ports with which qt4-mac conflicts that you have installed before attempting to build qt4-mac. The list of ports with which qt4-mac conflicts is contained in the output of "port info qt4-mac".