This is a semi-automatic report based on the latest archive rebuild results [1].
Apologies if it reaches you in error.
Excerpt from the buildlog:
libtool: compile: i686-linux-gnu-gcc -DHAVE_CONFIG_H -I. -I../include/IL -I ./../src-ILUT/include -I ./../include -D_FORTIFY_SOURCE=2 -msse -msse2 -msse3 -I/usr/include/SDL -D_GNU_SOURCE=1 -D_REENTRANT -Wall -g -DGLX_GLXEXT_LEGACY -O2 -MT libILUT_la-ilut_x11.lo -MD -MP -MF .deps/libILUT_la-ilut_x11.Tpo -c ./../src-ILUT/src/ilut_x11.c -fPIC -DPIC -o .libs/libILUT_la-ilut_x11.o
libtool: compile: i686-linux-gnu-gcc -DHAVE_CONFIG_H -I. -I../include/IL -I ./../src-ILUT/include -I ./../include -D_FORTIFY_SOURCE=2 -msse -msse2 -msse3 -I/usr/include/SDL -D_GNU_SOURCE=1 -D_REENTRANT -Wall -g -DGLX_GLXEXT_LEGACY -O2 -MT libILUT_la-ilut_opengl.lo -MD -MP -MF .deps/libILUT_la-ilut_opengl.Tpo -c ./../src-ILUT/src/ilut_opengl.c -o libILUT_la-ilut_opengl.o >/dev/null 2>&1
libtool: compile: i686-linux-gnu-gcc -DHAVE_CONFIG_H -I. -I../include/IL -I ./../src-ILUT/include -I ./../include -D_FORTIFY_SOURCE=2 -msse -msse2 -msse3 -I/usr/include/SDL -D_GNU_SOURCE=1 -D_REENTRANT -Wall -g -DGLX_GLXEXT_LEGACY -O2 -MT libILUT_la-ilut_x11.lo -MD -MP -MF .deps/libILUT_la-ilut_x11.Tpo -c ./../src-ILUT/src/ilut_x11.c -o libILUT_la-ilut_x11.o >/dev/null 2>&1
mv -f .deps/libILUT_la-ilut_x11.Tpo .deps/libILUT_la-ilut_x11.Plo
/bin/bash ../libtool --tag=CXX --mode=link i686-linux-gnu-g++ -msse -msse2 -msse3 -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -ltiff -lpng12 -lmng -llcms -ljpeg -version-info 2:0:1 -Wl,--as-needed -lm -lXpm -lXcursor -lpthread -ldl -lXxf86vm -o libIL.la -rpath /usr/lib libIL_la-il_alloc.lo libIL_la-il_doom.lo libIL_la-il_stack.lo libIL_la-il_pcx.lo libIL_la-il_rle.lo libIL_la-il_bits.lo libIL_la-il_endian.lo libIL_la-il_exr.lo libIL_la-il_jpeg.lo libIL_la-il_pic.lo libIL_la-il_sgi.lo libIL_la-il_bmp.lo libIL_la-il_error.lo libIL_la-il_lif.lo libIL_la-il_png.lo libIL_la-il_states.lo libIL_la-il_convbuff.lo libIL_la-il_files.lo libIL_la-il_main.lo libIL_la-il_pnm.lo libIL_la-il_targa.lo libIL_la-il_wdp.lo libIL_la-il_convert.lo libIL_la-il_gif.lo libIL_la-il_manip.lo libIL_la-il_profiles.lo libIL_la-il_tiff.lo libIL_la-il_cut.lo libIL_la-il_header.lo libIL_la-il_mdl.lo libIL_la-il_quantizer.lo libIL_la-il_utility.lo libIL_la-il_dcx.lo libIL_la-il_icon.lo libIL_la-il_mng.lo libIL_la-il_raw.lo libIL_la-il_wal.lo libIL_la-il_dds.lo libIL_la-il_internal.lo libIL_la-il_pal.lo libIL_la-il_rawdata.lo libIL_la-il_devil.lo libIL_la-il_io.lo libIL_la-il_pcd.lo libIL_la-il_register.lo libIL_la-il_psd.lo libIL_la-il_fastconv.lo libIL_la-il_neuquant.lo libIL_la-il_dds-save.lo libIL_la-il_psp.lo libIL_la-il_pix.lo libIL_la-il_pxr.lo libIL_la-il_vtf.lo libIL_la-il_xpm.lo libIL_la-il_hdr.lo libIL_la-il_icns.lo libIL_la-il_jp2.lo libIL_la-altivec_common.lo libIL_la-altivec_typeconversion.lo libIL_la-il_sun.lo libIL_la-il_nvidia.lo libIL_la-il_wbmp.lo libIL_la-il_squish.lo libIL_la-il_iff.lo libIL_la-il_ilbm.lo libIL_la-il_size.lo libIL_la-il_tpl.lo libIL_la-il_fits.lo libIL_la-il_iwi.lo libIL_la-il_blp.lo libIL_la-il_ftx.lo libIL_la-il_dicom.lo libIL_la-il_rot.lo libIL_la-il_texture.lo libIL_la-il_dpx.lo libIL_la-il_utx.lo libIL_la-il_mp3.lo -lm -lz
mv -f .deps/libILUT_la-ilut_opengl.Tpo .deps/libILUT_la-ilut_opengl.Plo
libtool: link: i686-linux-gnu-g++ -shared -nostdlib /usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu/crti.o /usr/lib/gcc/i686-linux-gnu/4.6/crtbeginS.o .libs/libIL_la-il_alloc.o .libs/libIL_la-il_doom.o .libs/libIL_la-il_stack.o .libs/libIL_la-il_pcx.o .libs/libIL_la-il_rle.o .libs/libIL_la-il_bits.o .libs/libIL_la-il_endian.o .libs/libIL_la-il_exr.o .libs/libIL_la-il_jpeg.o .libs/libIL_la-il_pic.o .libs/libIL_la-il_sgi.o .libs/libIL_la-il_bmp.o .libs/libIL_la-il_error.o .libs/libIL_la-il_lif.o .libs/libIL_la-il_png.o .libs/libIL_la-il_states.o .libs/libIL_la-il_convbuff.o .libs/libIL_la-il_files.o .libs/libIL_la-il_main.o .libs/libIL_la-il_pnm.o .libs/libIL_la-il_targa.o .libs/libIL_la-il_wdp.o .libs/libIL_la-il_convert.o .libs/libIL_la-il_gif.o .libs/libIL_la-il_manip.o .libs/libIL_la-il_profiles.o .libs/libIL_la-il_tiff.o .libs/libIL_la-il_cut.o .libs/libIL_la-il_header.o .libs/libIL_la-il_mdl.o .libs/libIL_la-il_quantizer.o .libs/libIL_la-il_utility.o .libs/libIL_la-il_dcx.o .libs/libIL_la-il_icon.o .libs/libIL_la-il_mng.o .libs/libIL_la-il_raw.o .libs/libIL_la-il_wal.o .libs/libIL_la-il_dds.o .libs/libIL_la-il_internal.o .libs/libIL_la-il_pal.o .libs/libIL_la-il_rawdata.o .libs/libIL_la-il_devil.o .libs/libIL_la-il_io.o .libs/libIL_la-il_pcd.o .libs/libIL_la-il_register.o .libs/libIL_la-il_psd.o .libs/libIL_la-il_fastconv.o .libs/libIL_la-il_neuquant.o .libs/libIL_la-il_dds-save.o .libs/libIL_la-il_psp.o .libs/libIL_la-il_pix.o .libs/libIL_la-il_pxr.o .libs/libIL_la-il_vtf.o .libs/libIL_la-il_xpm.o .libs/libIL_la-il_hdr.o .libs/libIL_la-il_icns.o .libs/libIL_la-il_jp2.o .libs/libIL_la-altivec_common.o .libs/libIL_la-altivec_typeconversion.o .libs/libIL_la-il_sun.o .libs/libIL_la-il_nvidia.o .libs/libIL_la-il_wbmp.o .libs/libIL_la-il_squish.o .libs/libIL_la-il_iff.o .libs/libIL_la-il_ilbm.o .libs/libIL_la-il_size.o .libs/libIL_la-il_tpl.o .libs/libIL_la-il_fits.o .libs/libIL_la-il_iwi.o .libs/libIL_la-il_blp.o .libs/libIL_la-il_ftx.o .libs/libIL_la-il_dicom.o .libs/libIL_la-il_rot.o .libs/libIL_la-il_texture.o .libs/libIL_la-il_dpx.o .libs/libIL_la-il_utx.o .libs/libIL_la-il_mp3.o /usr/lib/i386-linux-gnu/libtiff.so -lpng12 -lmng /usr/lib/i386-linux-gnu/liblcms.so -ljpeg -Wl,--as-needed -lXpm -lXcursor -lpthread -ldl -lXxf86vm -lz -L/usr/lib/gcc/i686-linux-gnu/4.6 -L/usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu -L/usr/lib/gcc/i686-linux-gnu/4.6/../../../../lib -L/lib/i386-linux-gnu -L/lib/../lib -L/usr/lib/i386-linux-gnu -L/usr/lib/../lib -L/usr/lib/gcc/i686-linux-gnu/4.6/../../.. -lstdc++ -lm -lc -lgcc_s /usr/lib/gcc/i686-linux-gnu/4.6/crtendS.o /usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu/crtn.o -msse -msse2 -msse3 -Wl,-soname -Wl,libIL.so.1 -o .libs/libIL.so.1.1.0
.libs/libIL_la-il_bmp.o: In function `ilFloatToHalfOverflow':
/build/buildd/devil-1.7.8/lib/./../src-IL/include/il_manip.h:34: multiple definition of `ilFloatToHalfOverflow'
.libs/libIL_la-il_jpeg.o:/build/buildd/devil-1.7.8/lib/./../src-IL/include/il_manip.h:34: first defined here
.libs/libIL_la-il_bmp.o: In function `ilFloatToHalf':
/build/buildd/devil-1.7.8/lib/./../src-IL/include/il_manip.h:50: multiple definition of `ilFloatToHalf'
.libs/libIL_la-il_jpeg.o:/build/buildd/devil-1.7.8/lib/./../src-IL/include/il_manip.h:50: first defined here
.libs/libIL_la-il_bmp.o: In function `ilHalfToFloat':
/build/buildd/devil-1.7.8/lib/./../src-IL/include/il_manip.h:178: multiple definition of `ilHalfToFloat'
.libs/libIL_la-il_jpeg.o:/build/buildd/devil-1.7.8/lib/./../src-IL/include/il_manip.h:178: first defined here
collect2: ld returned 1 exit status
make[2]: *** [libIL.la] Error 1
make[2]: Leaving directory `/build/buildd/devil-1.7.8/lib'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/build/buildd/devil-1.7.8'
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20120205-0204
FAILED [dpkg-buildpackage died]
The full buidlog can be found at https://launchpad.net/ubuntu/+archive/test-rebuild-20120201/+build/3143245/+files/buildlog_ubuntu-precise-i386.devil_1.7.8-6.1_FAILEDTOBUILD.txt.gz.
[1] http://people.ubuntuwire.org/~wgrant/rebuild-ftbfs-test/test-rebuild-20120201-precise.html
This bug was fixed in the package devil - 1.7.8-6.1ubuntu1
---------------
devil (1.7.8-6.1ubuntu1) precise; urgency=low
* Include il_manip.h only once to fix FTBFS. (LP: #935067)
-- Andreas Moog <email address hidden> Sun, 19 Feb 2012 18:00:09 +0100