vdkbuilder2 version 2.4.0-4.1 failed to build on i386

vdkbuilder2 version 2.4.0-4.1 failed to build on i386
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2413039

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2413039/+files/buildlog_ubuntu-natty-i386.vdkbuilder2_2.4.0-4.1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 21599 lines into the build log:

vdkb_prj.cc:(.text+0xaa5): warning: the use of `tempnam' is dangerous, better use `mkstemp'
/usr/bin/ld: vdkb_widsel.o: undefined reference to symbol 'XGetWindowAttributes'
/usr/bin/ld: note: 'XGetWindowAttributes' is defined in DSO /usr/lib/i386-linux-gnu/libX11.so.6 so try adding it to the linker command line
/usr/lib/i386-linux-gnu/libX11.so.6: could not read symbols: Invalid operation
collect2: ld returned 1 exit status
make[4]: *** [vdkb2] Error 1
make[4]: Leaving directory `/build/buildd/vdkbuilder2-2.4.0/vdkbuilder'
make[3]: *** [all-recursive] Error 1
make[3]: Leaving directory `/build/buildd/vdkbuilder2-2.4.0/vdkbuilder'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/build/buildd/vdkbuilder2-2.4.0'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/build/buildd/vdkbuilder2-2.4.0'
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110408-1759
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/vdkbuilder2-2.4.0