pgsql-asn1oid version 0.0.20100818-1 failed to build in oneiric

pgsql-asn1oid version 0.0.20100818-1 failed to build in oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110816/+build/2707918

Details about the rebuild:
http://people.ubuntuwire.org/~wgrant/rebuild-ftbfs-test/test-rebuild-20110816-oneiric.html

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110816/+build/2707918/+files/buildlog_ubuntu-oneiric-amd64.pgsql-asn1oid_0.0.20100818-1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 295 lines into the build log:

   dh_testdir
   dh_auto_clean
   dh_clean
 debian/rules build
dh build
   dh_testdir
   dh_auto_configure
   dh_auto_build
make[1]: Entering directory `/build/buildd/pgsql-asn1oid-0.0.20100818'
Makefile:7: /usr/lib/postgresql/9.0/lib/pgxs/src/makefiles/pgxs.mk: No such file or directory
make[1]: *** No rule to make target `/usr/lib/postgresql/9.0/lib/pgxs/src/makefiles/pgxs.mk'. Stop.
make[1]: Leaving directory `/build/buildd/pgsql-asn1oid-0.0.20100818'
dh_auto_build: make -j1 returned exit code 2
make: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110822-1424
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/pgsql-asn1oid-0.0.20100818