gtk-chtheme version 0.3.1-4 failed to build on i386

gtk-chtheme version 0.3.1-4 failed to build on i386
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2394788

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2394788/+files/buildlog_ubuntu-natty-i386.gtk-chtheme_0.3.1-4_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 1305 lines into the build log:

 dpkg-source --before-build gtk-chtheme-0.3.1
dpkg-buildpackage: host architecture i386
 /usr/bin/fakeroot debian/rules clean
dh_testdir
dh_testroot
rm -f build-stamp configure-stamp
/usr/bin/make clean
make[1]: Entering directory `/build/buildd/gtk-chtheme-0.3.1'
rm -f gtk-chtheme util.o stock.o theme_sel.o font_sel.o preview_pane.o about_dialog.o mainwin.o main.o
make[1]: Leaving directory `/build/buildd/gtk-chtheme-0.3.1'
dh_clean
 debian/rules build
dh_testdir
touch configure-stamp
dh_testdir
/usr/bin/make
make[1]: Entering directory `/build/buildd/gtk-chtheme-0.3.1'
cc -Wall -g -O2 -Wall -pthread -I/usr/include/atk-1.0 -I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0 -I/usr/lib/i386-linux-gnu/glib-2.0/include -I/usr/include/freetype2 -I/usr/include/libpng12 -I/usr/include/libdrm -I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pixman-1 -DGTK_DISABLE_BROKEN -DGTK_DISABLE_DEPRECATED -DPROJNAME='"Gtk+ 2.0 Change Theme"' -DVERSION='"0.3.1"' -c -o util.o util.c
util.c: In function 'unfocussable':
util.c:22:2: warning: implicit declaration of function 'GTK_OBJECT_FLAGS'
util.c:22:2: error: lvalue required as left operand of assignment
make[1]: *** [util.o] Error 1
make[1]: Leaving directory `/build/buildd/gtk-chtheme-0.3.1'
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110403-0926
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/gtk-chtheme-0.3.1