This is a semi-automatic report based on the latest archive rebuild results [1].
Apologies if it reaches you in error.
Excerpt from the buildlog:
[ 41%] Building CXX object CMakeFiles/qtemu.dir/vnc/remoteview.o
/usr/bin/c++ -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQTONLY -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -I/usr/include/qt4 -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtDesigner -I/usr/include/qt4/QtDeclarative -I/usr/include/qt4/QtScriptTools -I/usr/include/qt4/QtDBus -I/usr/include/qt4/QtXml -I/usr/include/qt4/QtSql -I/usr/include/qt4/QtNetwork -I/usr/include/qt4/QtXmlPatterns -I/usr/include/qt4/QtWebKit -I/usr/include/qt4/QtHelp -I/usr/include/qt4/QtUiTools -I/usr/include/qt4/QtTest -I/usr/include/qt4/QtScript -I/usr/include/qt4/QtSvg -I/usr/include/qt4/Qt3Support -I/usr/share/qt4/mkspecs/default -I"/build/buildd/qtemu-2.0~alpha1/obj-i686-linux-gnu" -I"/build/buildd/qtemu-2.0~alpha1/obj-i686-linux-gnu/vnc" -Wall -o CMakeFiles/qtemu.dir/vnc/remoteview.o -c "/build/buildd/qtemu-2.0~alpha1/vnc/remoteview.cpp"
/usr/bin/cmake -E cmake_progress_report "/build/buildd/qtemu-2.0~alpha1/obj-i686-linux-gnu/CMakeFiles" 9
[ 42%] Building CXX object CMakeFiles/qtemu.dir/vnc/vncclientthread.o
/usr/bin/c++ -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQTONLY -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -I/usr/include/qt4 -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtDesigner -I/usr/include/qt4/QtDeclarative -I/usr/include/qt4/QtScriptTools -I/usr/include/qt4/QtDBus -I/usr/include/qt4/QtXml -I/usr/include/qt4/QtSql -I/usr/include/qt4/QtNetwork -I/usr/include/qt4/QtXmlPatterns -I/usr/include/qt4/QtWebKit -I/usr/include/qt4/QtHelp -I/usr/include/qt4/QtUiTools -I/usr/include/qt4/QtTest -I/usr/include/qt4/QtScript -I/usr/include/qt4/QtSvg -I/usr/include/qt4/Qt3Support -I/usr/share/qt4/mkspecs/default -I"/build/buildd/qtemu-2.0~alpha1/obj-i686-linux-gnu" -I"/build/buildd/qtemu-2.0~alpha1/obj-i686-linux-gnu/vnc" -Wall -o CMakeFiles/qtemu.dir/vnc/vncclientthread.o -c "/build/buildd/qtemu-2.0~alpha1/vnc/vncclientthread.cpp"
/usr/bin/cmake -E cmake_progress_report "/build/buildd/qtemu-2.0~alpha1/obj-i686-linux-gnu/CMakeFiles" 10
[ 43%] Building CXX object CMakeFiles/qtemu.dir/vnc/vncview.o
/usr/bin/c++ -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQTONLY -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -I/usr/include/qt4 -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtDesigner -I/usr/include/qt4/QtDeclarative -I/usr/include/qt4/QtScriptTools -I/usr/include/qt4/QtDBus -I/usr/include/qt4/QtXml -I/usr/include/qt4/QtSql -I/usr/include/qt4/QtNetwork -I/usr/include/qt4/QtXmlPatterns -I/usr/include/qt4/QtWebKit -I/usr/include/qt4/QtHelp -I/usr/include/qt4/QtUiTools -I/usr/include/qt4/QtTest -I/usr/include/qt4/QtScript -I/usr/include/qt4/QtSvg -I/usr/include/qt4/Qt3Support -I/usr/share/qt4/mkspecs/default -I"/build/buildd/qtemu-2.0~alpha1/obj-i686-linux-gnu" -I"/build/buildd/qtemu-2.0~alpha1/obj-i686-linux-gnu/vnc" -Wall -o CMakeFiles/qtemu.dir/vnc/vncview.o -c "/build/buildd/qtemu-2.0~alpha1/vnc/vncview.cpp"
In file included from /usr/include/qt4/QtGui/qevent.h:57:0,
from /usr/include/qt4/QtGui/QMouseEvent:1,
from /build/buildd/qtemu-2.0~alpha1/vnc/vncview.cpp:44:
/usr/include/qt4/QtCore/qfile.h:117:21: error: macro "error" requires 3 arguments, but only 1 given
/usr/include/qt4/QtCore/qfile.h:117:15: error: expected ';' at end of member declaration
/usr/include/qt4/QtCore/qfile.h:117:23: error: declaration does not declare anything [-fpermissive]
make[3]: *** [CMakeFiles/qtemu.dir/vnc/vncview.o] Error 1
make[3]: Leaving directory `/build/buildd/qtemu-2.0~alpha1/obj-i686-linux-gnu'
make[2]: *** [CMakeFiles/qtemu.dir/all] Error 2
make[2]: Leaving directory `/build/buildd/qtemu-2.0~alpha1/obj-i686-linux-gnu'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/build/buildd/qtemu-2.0~alpha1/obj-i686-linux-gnu'
dh_auto_build: make -j1 returned exit code 2
make: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20120210-0613
FAILED [dpkg-buildpackage died]
The full buidlog can be found at https://launchpad.net/ubuntu/+archive/test-rebuild-20120201/+build/3168763/+files/buildlog_ubuntu-precise-i386.qtemu_2.0~alpha1-1ubuntu4_FAILEDTOBUILD.txt.gz.
[1] http://people.ubuntuwire.org/~wgrant/rebuild-ftbfs-test/test-rebuild-20120201-precise.html
Package has been removed.