libfsobasics version 0.9.0+git20100509-2ubuntu1 failed to build on i386

libfsobasics version 0.9.0+git20100509-2ubuntu1 failed to build on i386
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2400009

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2400009/+files/buildlog_ubuntu-natty-i386.libfsobasics_0.9.0%2Bgit20100509-2ubuntu1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 1146 lines into the build log:

  debug build.............: no

  prefix..................: /usr

------------------------------------------------------------------------

Now type 'make' to compile and 'make install' to install this package.
touch debian/stamp-autotools
/usr/bin/make -C .
make[1]: Entering directory `/build/buildd/libfsobasics-0.9.0+git20100509'
/usr/bin/make all-recursive
make[2]: Entering directory `/build/buildd/libfsobasics-0.9.0+git20100509'
Making all in fsobasics
make[3]: Entering directory `/build/buildd/libfsobasics-0.9.0+git20100509/fsobasics'
/usr/bin/valac -C --basedir .. --vapidir ../vapi --pkg posix --pkg linux --pkg libnl-2.0 --pkg glib-2.0 --pkg gio-2.0 --header fsobasics.h --library fsobasics-2.0 asyncworker.vala inotifier.vala kobjectnotifier.vala libinitexit.vala logger.vala netlinknotifier.vala netlinkutils.vala overlay.vala process.vala smartkeyfile.vala syncasync.vala threading.vala types.vala utilities.vala
**
ERROR:valasemanticanalyzer.c:2971:vala_semantic_analyzer_get_actual_type: assertion failed: (instance_type != NULL)
make[3]: *** [fsobasics.vala.stamp] Aborted
make[3]: Leaving directory `/build/buildd/libfsobasics-0.9.0+git20100509/fsobasics'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/build/buildd/libfsobasics-0.9.0+git20100509'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/build/buildd/libfsobasics-0.9.0+git20100509'
make: *** [debian/stamp-makefile-build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110403-0908
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/libfsobasics-0.9.0+git20100509