zpspell version 0.4.3-4 failed to build on i386

zpspell version 0.4.3-4 failed to build on i386
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2415252

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2415252/+files/buildlog_ubuntu-natty-i386.zpspell_0.4.3-4_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 1050 lines into the build log:

-- Looking for netdb.h - found
-- WARNING: you are using the obsolete 'PKGCONFIG' macro use FindPkgConfig
-- WARNING: you are using the obsolete 'PKGCONFIG' macro use FindPkgConfig
-- Found DBUS_LIBRARY: /lib/i386-linux-gnu/libdbus-1.so
-- Found DBUS_INCLUDE_DIR: /usr/include/dbus-1.0
-- Found GLIB2_LIBRARY: /usr/lib/i386-linux-gnu/libglib-2.0.so
-- Found GLIB2_INCLUDE_DIR: /usr/include/glib-2.0
CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
GLIB_CONFIG_DIR
   used as include directory in directory /build/buildd/zpspell-0.4.3

-- Configuring incomplete, errors occurred!
make: *** [obj-i686-linux-gnu/CMakeCache.txt] Error 1
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110408-1949
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/zpspell-0.4.3