ettercap version 1:0.7.3-2.1ubuntu1 failed to build on amd64 with GCC-4.6/oneiric

ettercap version 1:0.7.3-2.1ubuntu1 failed to build on amd64 with GCC-4.6/oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110413/+buildjob/2449528

Details about the rebuild:
https://lists.ubuntu.com/archives/ubuntu-devel/2011-April/033042.html

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110413/+buildjob/2449528/+files/buildlog_ubuntu-natty-amd64.ettercap_1%3A0.7.3-2.1ubuntu1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 6962 lines into the build log:

interfaces/gtk/libec_gtk.a(libec_gtk_a-ec_gtk_hosts.o): In function `gtkui_host_list':
/build/buildd/ettercap-0.7.3/src/interfaces/gtk/ec_gtk_hosts.c:176: undefined reference to `gtk_window_present'
/build/buildd/ettercap-0.7.3/src/interfaces/gtk/ec_gtk_hosts.c:241: undefined reference to `gtk_widget_show'
interfaces/gtk/libec_gtk.a(libec_gtk_a-ec_gtk_hosts.o): In function `gtkui_load_hosts':
/build/buildd/ettercap-0.7.3/src/interfaces/gtk/ec_gtk_hosts.c:91: undefined reference to `gtk_widget_destroy'
/build/buildd/ettercap-0.7.3/src/interfaces/gtk/ec_gtk_hosts.c:91: undefined reference to `gtk_widget_destroy'
collect2: ld returned 1 exit status
make[3]: *** [ettercap] Error 1
make[3]: Leaving directory `/build/buildd/ettercap-0.7.3/src'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/build/buildd/ettercap-0.7.3/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/build/buildd/ettercap-0.7.3'
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110422-1147
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/ettercap-0.7.3