fgarch version 2110.80-1 failed to build on i386

fgarch version 2110.80-1 failed to build on i386
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2392447

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2392447/+files/buildlog_ubuntu-natty-i386.fgarch_2110.80-1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Source-dependencies not satisfied'.
Excerpt 661 lines into the build log:

r-base-dev: missing
cdbs: missing
r-cran-fbasics: missing
r-cran-timedate: missing
r-cran-timeseries: missing
r-cran-vr: missing
xvfb: missing
xauth: missing
xfonts-base: missing
Checking for source dependency conflicts...
  /usr/bin/sudo /usr/bin/apt-get --purge $CHROOT_OPTIONS -q -y install debhelper r-base-dev cdbs r-cran-fbasics r-cran-timedate r-cran-timeseries r-cran-vr xvfb xauth xfonts-base
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:
 r-cran-vr : Depends: r-cran-mass but it is not going to be installed
             Depends: r-cran-class but it is not going to be installed
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 fgarch