xoscope version 2.0-3.1 failed to build on i386

xoscope version 2.0-3.1 failed to build on i386
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2414490

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2414490/+files/buildlog_ubuntu-natty-i386.xoscope_2.0-3.1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 1796 lines into the build log:

gtkdatabox.c:1515:7: warning: implicit declaration of function 'gtk_vruler_new'
gtkdatabox.c:1515:13: warning: assignment makes pointer from integer without a cast
Function `gtk_vruler_new' implicitly converted to pointer at gtkdatabox.c:1515
gtkdatabox.c:1518:7: error: too many arguments to function 'gtk_databox_set_vruler'
gtkdatabox.c:254:1: note: declared here
gtkdatabox.c: In function 'gtk_databox_graph_add':
gtkdatabox.c:1407:1: warning: control reaches end of non-void function
make[3]: *** [gtkdatabox.o] Error 1
make[3]: Leaving directory `/build/buildd/xoscope-2.0/gtkdatabox-0.6.0.0/gtk'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/build/buildd/xoscope-2.0'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/build/buildd/xoscope-2.0'
make: *** [debian/stamp-makefile-build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110408-1931
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/xoscope-2.0