ftgl version 2.1.3~rc5-3 failed to build on i386

ftgl version 2.1.3~rc5-3 failed to build on i386
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2392953

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110329/+buildjob/2392953/+files/buildlog_ubuntu-natty-i386.ftgl_2.1.3%7Erc5-3_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 1643 lines into the build log:

(cd .libs && rm -f libftgl.la && ln -s ../libftgl.la libftgl.la)
make[3]: Leaving directory `/build/buildd/ftgl-2.1.3~rc5/src'
Making all in test
make[3]: Entering directory `/build/buildd/ftgl-2.1.3~rc5/test'
make[3]: Nothing to be done for `all'.
make[3]: Leaving directory `/build/buildd/ftgl-2.1.3~rc5/test'
Making all in demo
make[3]: Entering directory `/build/buildd/ftgl-2.1.3~rc5/demo'
g++ -DHAVE_CONFIG_H -I. -I.. -I../src -I../src -Wall -Wpointer-arith -Wcast-align -Wcast-qual -Wshadow -Wsign-compare -I/usr/include/freetype2 -g -O2 -MT simple-simple.o -MD -MP -MF .deps/simple-simple.Tpo -c -o simple-simple.o `test -f 'simple.cpp' || echo './'`simple.cpp
mv -f .deps/simple-simple.Tpo .deps/simple-simple.Po
/bin/bash ../libtool --tag=CXX --mode=link g++ -I/usr/include/freetype2 -g -O2 -L/usr/lib/i386-linux-gnu -lfreetype -lz -lglut -Wl,-Bsymbolic-functions -o simple simple-simple.o ../src/libftgl.la
mkdir .libs
g++ -I/usr/include/freetype2 -g -O2 -Wl,-Bsymbolic-functions -o .libs/simple simple-simple.o -L/usr/lib/i386-linux-gnu /usr/lib/i386-linux-gnu/libfreetype.so -lz -lglut ../src/.libs/libftgl.so
/usr/bin/ld: simple-simple.o: undefined reference to symbol 'gluLookAt'
/usr/bin/ld: note: 'gluLookAt' is defined in DSO /usr/lib/libGLU.so.1 so try adding it to the linker command line
/usr/lib/libGLU.so.1: could not read symbols: Invalid operation
collect2: ld returned 1 exit status
make[3]: *** [simple] Error 1
make[3]: Leaving directory `/build/buildd/ftgl-2.1.3~rc5/demo'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/build/buildd/ftgl-2.1.3~rc5'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/build/buildd/ftgl-2.1.3~rc5'
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110403-0938
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/ftgl-2.1.3~rc5