Error building debug helper in Qt Creator

Error in Qt Creator 2.1rc1 (was not such error previously in 2.0.1, using qt in PATH):

Work error "/usr/bin/make" in /home/alex/.local/share/data/Nokia/QtCreator/qtc-qmlobserver/216752463/: Process returned code 2:
/usr/bin/uic recopts.ui -o ui_recopts.h
/usr/bin/uic proxysettings.ui -o ui_proxysettings.h
/usr/bin/moc -DGL_SUPPORTED -DBUILD_QMLJSDEBUGGER_STATIC_LIB -DQWEAKPOINTER_ENABLE_ARROW -DQT_DECLARATIVE_LIB -DQT_SCRIPT_LIB -DQT_SQL_LIB -DQT_OPENGL_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/QtCore -I/usr/include/QtNetwork -I/usr/include/QtGui -I/usr/include/QtOpenGL -I/usr/include/QtSql -I/usr/include/QtScript -I/usr/include/QtDeclarative -I/usr/include -I. -Iqmljsdebugger/include -Iqmljsdebugger/editor -I/usr/X11R6/include -I. -I. qmlruntime.cpp -o qmlruntime.moc
g++ -c -pipe -g -Wall -W -D_REENTRANT -DGL_SUPPORTED -DBUILD_QMLJSDEBUGGER_STATIC_LIB -DQWEAKPOINTER_ENABLE_ARROW -DQT_DECLARATIVE_LIB -DQT_SCRIPT_LIB -DQT_SQL_LIB -DQT_OPENGL_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/QtCore -I/usr/include/QtNetwork -I/usr/include/QtGui -I/usr/include/QtOpenGL -I/usr/include/QtSql -I/usr/include/QtScript -I/usr/include/QtDeclarative -I/usr/include -I. -Iqmljsdebugger/include -Iqmljsdebugger/editor -I/usr/X11R6/include -I. -I. -o qmlruntime.o qmlruntime.cpp
In file included from qmlruntime.cpp:67:0:
/usr/include/QtCore/private/qabstractanimation_p.h:1:65: fatal error: ../../../src/corelib/animation/qabstractanimation_p.h: No such file or directory
compilation terminated.
make: *** [qmlruntime.o] Erorr 1