moserial version 2.28.2-0ubuntu2 failed to build on i386

moserial version 2.28.2-0ubuntu2 failed to build on i386
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2404670

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2404670/+files/buildlog_ubuntu-natty-i386.moserial_2.28.2-0ubuntu2_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 1743 lines into the build log:

src/MainWindow.vala:169.17-169.22: error: `Action' is an ambiguous reference between `GLib.Action' and `Gtk.Action'
                Action about = (Action)builder.get_object("menubar_about");
                ^^^^^^
src/MainWindow.vala:212.36-212.41: error: `Action' is an ambiguous reference between `GLib.Action' and `Gtk.Action'
                Action contents = (Action)builder.get_object("menubar_contents");
                                   ^^^^^^
src/MainWindow.vala:212.17-212.22: error: `Action' is an ambiguous reference between `GLib.Action' and `Gtk.Action'
                Action contents = (Action)builder.get_object("menubar_contents");
                ^^^^^^
Compilation failed: 22 error(s), 3 warning(s)
make[1]: *** [src/moserial.vala.stamp] Error 1
make[1]: Leaving directory `/build/buildd/moserial-2.28.2'
dh_auto_build: make -j1 returned exit code 2
make: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110408-1611
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/moserial-2.28.2