kcoloredit version 5:2.0.0-kde4.4.0-0ubuntu4 failed to build in oneiric

kcoloredit version 5:2.0.0-kde4.4.0-0ubuntu4 failed to build in oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110816/+build/2697542

Details about the rebuild:
http://people.ubuntuwire.org/~wgrant/rebuild-ftbfs-test/test-rebuild-20110816-oneiric.html

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110816/+build/2697542/+files/buildlog_ubuntu-oneiric-amd64.kcoloredit_5%3A2.0.0-kde4.4.0-0ubuntu4_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 1078 lines into the build log:

cd /build/buildd/kcoloredit-2.0.0-kde4.4.0/obj-x86_64-linux-gnu/src && /usr/bin/c++ -D_BSD_SOURCE -g -O2 -Wnon-virtual-dtor -Wno-long-long -ansi -Wundef -Wcast-align -Wchar-subscripts -Wall -W -Wpointer-arith -Wformat-security -fno-exceptions -DQT_NO_EXCEPTIONS -fno-check-new -fno-common -Woverloaded-virtual -fno-threadsafe-statics -fvisibility=hidden -Werror=return-type -fvisibility-inlines-hidden -DNDEBUG -DQT_NO_DEBUG -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/obj-x86_64-linux-gnu/src -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/core -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/itemviews -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/widgets/colorselectors/kdeselector -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/widgets/colorselectors/gtkselector -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/widgets/colorselectors/blenderselector -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/widgets/colorselectors/builderselector -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/widgets/colorselectors -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/widgets/colorinfo -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/widgets -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/dialog -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/app -I/usr/include/KDE -I/usr/include/qt4/phonon -I/usr/include/qt4/QtXmlPatterns -I/usr/include/qt4/QtXml -I/usr/include/qt4/QtUiTools -I/usr/include/qt4/QtTest -I/usr/include/qt4/QtSvg -I/usr/include/qt4/QtSql -I/usr/include/qt4/QtScriptTools -I/usr/include/qt4/QtScript -I/usr/include/qt4/QtNetwork -I/usr/include/qt4/QtHelp -I/usr/include/qt4/QtDesigner -I/usr/include/qt4/QtDeclarative -I/usr/include/qt4/QtDBus -I/usr/include/qt4/Qt3Support -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtCore -I/usr/include/qt4/Qt -I/usr/share/qt4/mkspecs/default -I/usr/include/qt4 -o CMakeFiles/kcoloredit.dir/widgets/colorselectors/colorselector.o -c /build/buildd/kcoloredit-2.0.0-kde4.4.0/src/widgets/colorselectors/colorselector.cpp
/usr/bin/cmake -E cmake_progress_report /build/buildd/kcoloredit-2.0.0-kde4.4.0/obj-x86_64-linux-gnu/CMakeFiles 16
[ 19%] Building CXX object src/CMakeFiles/kcoloredit.dir/widgets/colortoolwidget.o
cd /build/buildd/kcoloredit-2.0.0-kde4.4.0/obj-x86_64-linux-gnu/src && /usr/bin/c++ -D_BSD_SOURCE -g -O2 -Wnon-virtual-dtor -Wno-long-long -ansi -Wundef -Wcast-align -Wchar-subscripts -Wall -W -Wpointer-arith -Wformat-security -fno-exceptions -DQT_NO_EXCEPTIONS -fno-check-new -fno-common -Woverloaded-virtual -fno-threadsafe-statics -fvisibility=hidden -Werror=return-type -fvisibility-inlines-hidden -DNDEBUG -DQT_NO_DEBUG -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/obj-x86_64-linux-gnu/src -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/core -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/itemviews -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/widgets/colorselectors/kdeselector -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/widgets/colorselectors/gtkselector -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/widgets/colorselectors/blenderselector -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/widgets/colorselectors/builderselector -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/widgets/colorselectors -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/widgets/colorinfo -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/widgets -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/dialog -I/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/app -I/usr/include/KDE -I/usr/include/qt4/phonon -I/usr/include/qt4/QtXmlPatterns -I/usr/include/qt4/QtXml -I/usr/include/qt4/QtUiTools -I/usr/include/qt4/QtTest -I/usr/include/qt4/QtSvg -I/usr/include/qt4/QtSql -I/usr/include/qt4/QtScriptTools -I/usr/include/qt4/QtScript -I/usr/include/qt4/QtNetwork -I/usr/include/qt4/QtHelp -I/usr/include/qt4/QtDesigner -I/usr/include/qt4/QtDeclarative -I/usr/include/qt4/QtDBus -I/usr/include/qt4/Qt3Support -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtCore -I/usr/include/qt4/Qt -I/usr/share/qt4/mkspecs/default -I/usr/include/qt4 -o CMakeFiles/kcoloredit.dir/widgets/colortoolwidget.o -c /build/buildd/kcoloredit-2.0.0-kde4.4.0/src/widgets/colortoolwidget.cpp
/build/buildd/kcoloredit-2.0.0-kde4.4.0/src/widgets/colortoolwidget.cpp:40:22: fatal error: X11/Xlib.h: No such file or directory
compilation terminated.
make[3]: *** [src/CMakeFiles/kcoloredit.dir/widgets/colortoolwidget.o] Error 1
make[3]: Leaving directory `/build/buildd/kcoloredit-2.0.0-kde4.4.0/obj-x86_64-linux-gnu'
make[2]: *** [src/CMakeFiles/kcoloredit.dir/all] Error 2
make[2]: Leaving directory `/build/buildd/kcoloredit-2.0.0-kde4.4.0/obj-x86_64-linux-gnu'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/build/buildd/kcoloredit-2.0.0-kde4.4.0/obj-x86_64-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 20110821-1221
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/kcoloredit-2.0.0-kde4.4.0