tkpng version 0.9-1 failed to build in oneiric

tkpng version 0.9-1 failed to build in oneiric
Link to failed build: https://launchpad.net/ubuntu/+archive/test-rebuild-20110816/+build/2713127

Details about the rebuild:
http://people.ubuntuwire.org/~wgrant/rebuild-ftbfs-test/test-rebuild-20110816-oneiric.html

Direct link to the build log: https://launchpad.net/ubuntu/+archive/test-rebuild-20110816/+build/2713127/+files/buildlog_ubuntu-oneiric-amd64.tkpng_0.9-1_FAILEDTOBUILD.txt.gz

This log snippet might be of interest, since it triggered the matcher 'Purging chroot-autobuild'.
Excerpt 631 lines into the build log:

touch config-stamp
dh_testdir
/usr/bin/make
make[1]: Entering directory `/build/buildd/tkpng-0.9'
gcc -DPACKAGE_NAME=\"tkpng\" -DPACKAGE_TARNAME=\"tkpng\" -DPACKAGE_VERSION=\"0.9\" -DPACKAGE_STRING=\"tkpng\ 0.9\" -DPACKAGE_BUGREPORT=\"\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_LIMITS_H=1 -DHAVE_SYS_PARAM_H=1 -DUSE_THREAD_ALLOC=1 -D_REENTRANT=1 -D_THREAD_SAFE=1 -DTCL_THREADS=1 -DMODULE_SCOPE=extern\ __attribute__\(\(__visibility__\(\"hidden\"\)\)\) -D_LARGEFILE64_SOURCE=1 -DTCL_WIDE_INT_IS_LONG=1 -DUSE_TCL_STUBS=1 -DUSE_TK_STUBS=1 -I"/usr/include/tcl8.5/" -I"/usr/include/tcl8.5/" -g -O2 -pipe -O2 -fomit-frame-pointer -Wall -Wno-implicit-int -fPIC -c `echo ./generic/tkImgPNG.c` -o tkImgPNG.o
gcc -DPACKAGE_NAME=\"tkpng\" -DPACKAGE_TARNAME=\"tkpng\" -DPACKAGE_VERSION=\"0.9\" -DPACKAGE_STRING=\"tkpng\ 0.9\" -DPACKAGE_BUGREPORT=\"\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_LIMITS_H=1 -DHAVE_SYS_PARAM_H=1 -DUSE_THREAD_ALLOC=1 -D_REENTRANT=1 -D_THREAD_SAFE=1 -DTCL_THREADS=1 -DMODULE_SCOPE=extern\ __attribute__\(\(__visibility__\(\"hidden\"\)\)\) -D_LARGEFILE64_SOURCE=1 -DTCL_WIDE_INT_IS_LONG=1 -DUSE_TCL_STUBS=1 -DUSE_TK_STUBS=1 -I"/usr/include/tcl8.5/" -I"/usr/include/tcl8.5/" -g -O2 -pipe -O2 -fomit-frame-pointer -Wall -Wno-implicit-int -fPIC -c `echo ./generic/tkImgPNGInit.c` -o tkImgPNGInit.o
rm -f libtkpng0.9.so
gcc -shared -g -O2 -pipe -O2 -fomit-frame-pointer -Wall -Wno-implicit-int -fPIC -lm -Wl,-z,defs -Wl,--no-undefined -Wl,--as-needed -Wl,--export-dynamic -o libtkpng0.9.so tkImgPNG.o tkImgPNGInit.o -lz -L/usr/lib -ltclstub8.5 -L/usr/lib -ltkstub8.5
tkImgPNG.o: In function `PNGCheckColor':
/build/buildd/tkpng-0.9/./generic/tkImgPNG.c:1118: undefined reference to `pow'
collect2: ld returned 1 exit status
make[1]: *** [libtkpng0.9.so] Error 1
make[1]: Leaving directory `/build/buildd/tkpng-0.9'
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20110824-0057
FAILED [dpkg-buildpackage died]
Purging chroot-autobuild/build/buildd/tkpng-0.9