If QT_NO_IM is set the compilation of Qt fails

Configure:
./configure -prefix . -debug -no-webkit -nomake examples -nomake demos -nomake docs -D QT_NO_IM

If -D QT_NO_IM option is set the compilation of Qt fails on Ubuntu with:

kernel/qwidget_x11.cpp: In member function ‘void QWidgetPrivate::create_sys(WId, bool, bool)’:
kernel/qwidget_x11.cpp:916: error: invalid use of incomplete type ‘struct QInputContext’
../../include/QtGui/../../src/gui/kernel/qwidget.h:98: error: forward declaration of ‘struct QInputContext’
kernel/qwidget_x11.cpp: In member function ‘void QWidget::destroy(bool, bool)’:
kernel/qwidget_x11.cpp:1109: error: ‘class QWidgetPrivate’ has no member named ‘ic’
kernel/qwidget_x11.cpp:1110: error: ‘class QWidgetPrivate’ has no member named ‘ic’
kernel/qwidget_x11.cpp:1116: error: invalid use of incomplete type ‘struct QInputContext’
../../include/QtGui/../../src/gui/kernel/qwidget.h:98: error: forward declaration of ‘struct QInputContext’

On Windows 7:
In file included from ..\..\include\QtGui/private/qwininputcontext_p.h:1,from kernel\qwidget.cpp:93:

..\..\include\QtGui/private/../../../src/gui/inputmethod/qwininputcontext_p.h:75: error: invalid use of incomplete type 'struct QInputContext'

..\..\include/QtGui/../../src/gui/kernel/qwidget.h:98: error: forward declaration of 'struct QInputContext'

kernel\qwidget.cpp: In member function 'void QWidget::setInputContext(QInputContext*)':