ivtools version 1.2.8a1-4 failed to build on armel

ivtools version 1.2.8a1-4 failed to build on armel
Link to failed build: https://launchpad.net/ubuntu/+source/ivtools/1.2.8a1-4/+build/2517420

Direct link to the build log: https://launchpad.net/ubuntu/+source/ivtools/1.2.8a1-4/+build/2517420/+files/buildlog_ubuntu-oneiric-armel.ivtools_1.2.8a1-4_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Source-dependencies not satisfied'.
Excerpt 290 lines into the build log:

Checking for source dependency conflicts...
  /usr/bin/sudo /usr/bin/apt-get --purge $CHROOT_OPTIONS -q -y install debhelper quilt autotools-dev autoconf automake libtool zlib1g-dev x11-utils xutils-dev x11proto-core-dev libx11-dev libxext-dev libxmu-dev libxt-dev libtiff4-dev libace-dev ghostscript
Reading package lists...
Building dependency tree...
Reading state information...
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 libace-dev : Depends: libace-5.6.3 (= 5.6.3-6) but it is not installable
E: Broken packages
apt-get failed.
Package installation failed
Trying to reinstall removed packages:
Trying to uninstall newly installed packages:
Source-dependencies not satisfied; skipping ivtools