gnome-mousetrap version 0.4-1 failed to build on i386

gnome-mousetrap version 0.4-1 failed to build on i386
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2394092

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2394092/+files/buildlog_ubuntu-natty-i386.gnome-mousetrap_0.4-1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 1682 lines into the build log:

checking if gcc static flag -static works... yes
checking if gcc supports -c -o file.o... yes
checking if gcc supports -c -o file.o... (cached) yes
checking whether the gcc linker (/usr/bin/ld) supports shared libraries... yes
checking whether -lc should be explicitly linked in... no
checking dynamic linker characteristics... GNU/Linux ld.so
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... no
checking whether python2.6 version >= 2.6... yes
checking for python2.6 version... 2.6
checking for python2.6 platform... linux2
checking for python2.6 script directory... ${prefix}/lib/python2.6/dist-packages
checking for python2.6 extension module directory... ${exec_prefix}/lib/python2.6/dist-packages
checking for headers required to compile python extensions... found
checking for python module gettext... yes
checking for python module getopt... yes
checking for python module Xlib... yes
checking for python module pyatspi... yes
checking for python module opencv... no
configure: error: Could not find python module opencv
make: *** [config.status] Error 1
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110403-1126
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/gnome-mousetrap-0.4