gnuradio version 3.2.2.dfsg-1ubuntu5 failed to build on i386

gnuradio version 3.2.2.dfsg-1ubuntu5 failed to build on i386
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2394266

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2394266/+files/buildlog_ubuntu-natty-i386.gnuradio_3.2.2.dfsg-1ubuntu5_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 8092 lines into the build log:

                 from ./SpectrumGUIClass.h:14,
                 from ./qtgui.h:27,
                 from ./qtgui_sink_f.h:30,
                 from qtgui_sink_f.cc:27:
/usr/include/qwtplot3d-qt4/qwt3d_color.h:22:23: warning: 'virtual Qwt3D::RGBA Qwt3D::Color::operator()(const Qwt3D::Triple&) const' was hidden
./Waterfall3DDisplayPlot.h:18:23: warning: by 'virtual Qwt3D::RGBA Waterfall3DColorMap::operator()(double, double, double) const'
mv -f .deps/qtgui_sink_f.Tpo .deps/qtgui_sink_f.Plo
/bin/bash ../../../libtool --tag=CXX --mode=link g++ -Wall -Woverloaded-virtual -g -O2 -pthread -version-info 0:0:0 -Wl,-Bsymbolic-functions -o libgnuradio-qtgui.la -rpath /usr/lib FrequencyDisplayPlot.lo TimeDomainDisplayPlot.lo WaterfallDisplayPlot.lo Waterfall3DDisplayPlot.lo waterfallGlobalData.lo ConstellationDisplayPlot.lo spectrumdisplayform.lo SpectrumGUIClass.lo spectrumUpdateEvents.lo plot_waterfall.lo spectrumdisplayform_moc.lo FrequencyDisplayPlot_moc.lo TimeDomainDisplayPlot_moc.lo WaterfallDisplayPlot_moc.lo Waterfall3DDisplayPlot_moc.lo ConstellationDisplayPlot_moc.lo qtgui_sink_c.lo qtgui_sink_f.lo /build/buildd/gnuradio-3.2.2.dfsg/gnuradio-core/src/lib/libgnuradio-core.la -lstdc++ -lqwt-qt4 -lqwtplot3d-qt4 -pthread -L/usr/X11R6/lib -L/usr/lib/i386-linux-gnu -lQtOpenGL -lGL -lQtGui -laudio -lXt -lpng -lgobject-2.0 -lSM -lICE -lXi -lXrender -lfreetype -lXext -lX11 -lQtCore -lfontconfig -lpthread -lz -lm -ldl -lgthread-2.0 -lrt -lglib-2.0
libtool: link: g++ -shared -nostdlib /usr/lib/i386-linux-gnu/gcc/i686-linux-gnu/4.5.2/../../../crti.o /usr/lib/i386-linux-gnu/gcc/i686-linux-gnu/4.5.2/crtbeginS.o .libs/FrequencyDisplayPlot.o .libs/TimeDomainDisplayPlot.o .libs/WaterfallDisplayPlot.o .libs/Waterfall3DDisplayPlot.o .libs/waterfallGlobalData.o .libs/ConstellationDisplayPlot.o .libs/spectrumdisplayform.o .libs/SpectrumGUIClass.o .libs/spectrumUpdateEvents.o .libs/plot_waterfall.o .libs/spectrumdisplayform_moc.o .libs/FrequencyDisplayPlot_moc.o .libs/TimeDomainDisplayPlot_moc.o .libs/WaterfallDisplayPlot_moc.o .libs/Waterfall3DDisplayPlot_moc.o .libs/ConstellationDisplayPlot_moc.o .libs/qtgui_sink_c.o .libs/qtgui_sink_f.o -Wl,-rpath -Wl,/build/buildd/gnuradio-3.2.2.dfsg/gnuradio-core/src/lib/.libs -Wl,-rpath -Wl,/build/buildd/gnuradio-3.2.2.dfsg/omnithread/.libs -Wl,-rpath -Wl,/build/buildd/gnuradio-3.2.2.dfsg/gruel/src/lib/.libs /build/buildd/gnuradio-3.2.2.dfsg/gnuradio-core/src/lib/.libs/libgnuradio-core.so /build/buildd/gnuradio-3.2.2.dfsg/omnithread/.libs/libgromnithread.so /build/buildd/gnuradio-3.2.2.dfsg/gruel/src/lib/.libs/libgruel.so -L/usr/lib -lboost_thread-mt /usr/lib/libfftw3f.so -lgsl -lgslcblas -lblas -lqwt-qt4 -lqwtplot3d-qt4 -L/usr/X11R6/lib -L/usr/lib/i386-linux-gnu -lQtOpenGL -lGL -lQtGui -laudio -lXt -lpng /usr/lib/i386-linux-gnu/libgobject-2.0.so -lSM -lICE -lXi -lXrender /usr/lib/i386-linux-gnu/libfreetype.so -lXext -lX11 -lQtCore -lfontconfig -lpthread -lz -ldl /usr/lib/i386-linux-gnu/libgthread-2.0.so -lrt /usr/lib/i386-linux-gnu/libglib-2.0.so -L/usr/lib/i386-linux-gnu/gcc/i686-linux-gnu/4.5.2 -L/usr/lib/i386-linux-gnu/gcc/i686-linux-gnu/4.5.2/../../.. -lstdc++ -lm -lc -lgcc_s /usr/lib/i386-linux-gnu/gcc/i686-linux-gnu/4.5.2/crtendS.o /usr/lib/i386-linux-gnu/gcc/i686-linux-gnu/4.5.2/../../../crtn.o -pthread -Wl,-Bsymbolic-functions -pthread -pthread -Wl,-soname -Wl,libgnuradio-qtgui.so.0 -o .libs/libgnuradio-qtgui.so.0.0.0
/usr/bin/ld: cannot find -lXi
collect2: ld returned 1 exit status
make[6]: *** [libgnuradio-qtgui.la] Error 1
make[6]: Leaving directory `/build/buildd/gnuradio-3.2.2.dfsg/gr-qtgui/src/lib'
make[5]: *** [all] Error 2
make[5]: Leaving directory `/build/buildd/gnuradio-3.2.2.dfsg/gr-qtgui/src/lib'
make[4]: *** [all-recursive] Error 1
make[4]: Leaving directory `/build/buildd/gnuradio-3.2.2.dfsg/gr-qtgui/src'
make[3]: *** [all-recursive] Error 1
make[3]: Leaving directory `/build/buildd/gnuradio-3.2.2.dfsg/gr-qtgui'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/build/buildd/gnuradio-3.2.2.dfsg'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/build/buildd/gnuradio-3.2.2.dfsg'
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110403-1135
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/gnuradio-3.2.2.dfsg