sweethome3d version 3.0+dfsg-1 failed to build on i386

sweethome3d version 3.0+dfsg-1 failed to build on i386
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2411258

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2411258/+files/buildlog_ubuntu-natty-i386.sweethome3d_3.0%2Bdfsg-1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 1740 lines into the build log:

    [javac] location: class com.eteks.sweethome3d.swing.ImportedFurnitureWizardStepsPanel
    [javac] final BasicService service = basicService;
    [javac] ^
    [javac] Note: Some input files use unchecked or unsafe operations.
    [javac] Note: Recompile with -Xlint:unchecked for details.
    [javac] 78 errors

BUILD FAILED
/build/buildd/sweethome3d-3.0+dfsg/build.xml:43: Compile failed; see the compiler error output for details.

Total time: 3 seconds
make[1]: *** [override_dh_auto_build] Error 1
make[1]: Leaving directory `/build/buildd/sweethome3d-3.0+dfsg'
make: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110408-1447
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/sweethome3d-3.0+dfsg