Error building Mac debug helper for Qt 5

Building helper(s) with toolchain 'MacPorts Clang (x86 32bit)'...
Building helper 'GDB helper' in /Qt/5.0/qtbase/qtc-debugging-helper/


Running /Qt/5.0/qtbase/bin/qmake -spec macx-clang-libc++-32 dumper.pro -nocache CONFIG+=x86 ...

Running /usr/bin/make all -k ...
Error running '/usr/bin/make all -k' in /Qt/5.0/qtbase/qtc-debugging-helper/: The process returned exit code 2:
clang++ -c -pipe -mmacosx-version-min=10.6 -arch i386 -stdlib=libc++ -g -gdwarf-2 -Wall -W -fPIC -DUSE_QT_CORE=1 -DUSE_QT_GUI=1 -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../mkspecs/macx-clang-libc++-32 -I. -I../include -I../include/QtWidgets -I../include/QtGui -I../include/QtCore -I. -I/System/Library/Frameworks/OpenGL.framework/Versions/A/Headers -I/System/Library/Frameworks/AGL.framework/Headers -F/Qt/5.0/qtbase/lib -o dumper.o dumper.cpp
dumper.cpp:1698:76: error: no member named 'numBytes' in 'QImage'
    const QByteArray ba(QByteArray::fromRawData((const char*)im.bits(), im.numBytes()));
                                                                        ~~ ^
dumper.cpp:2371:50: error: no member named 'toAscii' in 'QString'
    const int index = mob->indexOfProperty(iname.toAscii());
                                           ~~~~~ ^
2 errors generated.
make: *** [dumper.o] Error 1
make: Target `all' not remade because of errors.
Build failed.