swi-prolog version 5.10.1-1 failed to build on i386

swi-prolog version 5.10.1-1 failed to build on i386
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2411266

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2411266/+files/buildlog_ubuntu-natty-i386.swi-prolog_5.10.1-1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 3350 lines into the build log:

x11/xcommon.c:171:29: warning: comparison between pointer and integer
x11/xcommon.c: In function 'CtoEvent':
x11/xcommon.c:910:14: warning: assignment makes integer from pointer without a cast
make[5]: *** [x11/xcommon.o] Error 1
make[5]: Leaving directory `/build/buildd/swi-prolog-5.10.1/packages/xpce/src'
make[4]: *** [dowsobjs] Error 2
make[4]: Leaving directory `/build/buildd/swi-prolog-5.10.1/packages/xpce/src'
make[3]: *** [all] Error 2
make[3]: Leaving directory `/build/buildd/swi-prolog-5.10.1/packages/xpce'
make[2]: *** [objects] Error 1
make[2]: Leaving directory `/build/buildd/swi-prolog-5.10.1/packages'
make[1]: *** [packages] Error 2
make[1]: Leaving directory `/build/buildd/swi-prolog-5.10.1'
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110408-1454
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/swi-prolog-5.10.1