sciteproj version 0.4.00-1 failed to build on i386

sciteproj version 0.4.00-1 failed to build on i386
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2409998

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2409998/+files/buildlog_ubuntu-natty-i386.sciteproj_0.4.00-1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 1372 lines into the build log:

-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- cmake module path:/build/buildd/sciteproj-0.4.00/cmake
-- Building Release executable
-- Found Freetype: /usr/lib/i386-linux-gnu/libfreetype.so
-- Some or all of the gtk libraries were not found. (missing: GTK2_GLIBCONFIG_INCLUDE_DIR)
CMake Error at CMakeLists.txt:68 (message):
  GTK not found!

-- 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 20110408-1854
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/sciteproj-0.4.00