gtklp version 1.2.7-2.1 failed to build in oneiric

gtklp version 1.2.7-2.1 failed to build in oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110816/+build/2695320

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/2695320/+files/buildlog_ubuntu-oneiric-amd64.gtklp_1.2.7-2.1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 1390 lines into the build log:

Making all in gtklp
make[3]: Entering directory `/build/buildd/gtklp-1.2.7/gtklp'
gcc -DHAVE_CONFIG_H -I. -I.. -Wall -I../include -I../libgtklp -pthread -I/usr/include/gtk-2.0 -I/usr/lib/x86_64-linux-gnu/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -DHAVE_LIBSSL -DLOCALEDIR=\"/usr/share/locale\" -DHAVE_GTK2 -DMAX_PRT=150 -g -O2 -g -O2 -Wall -c file.c
In file included from file.c:36:0:
gtklp.h:99:1: error: unknown type name 'ppd_file_t'
file.c: In function 'fileSelDialogOk':
file.c:80:6: warning: variable 'i1' set but not used [-Wunused-but-set-variable]
make[3]: *** [file.o] Error 1
make[3]: Leaving directory `/build/buildd/gtklp-1.2.7/gtklp'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/build/buildd/gtklp-1.2.7'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/build/buildd/gtklp-1.2.7'
make: *** [debian/stamp-makefile-build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110821-0323
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/gtklp-1.2.7