Binary package hint: perl
Attempting to build the 'perl' package fails on natty.
libc6 in natty has moved the core system libs (such as libm) that used to be in /lib into /lib/x86_64-linux-gnu. Perl's Configure script does not include this path in libspath/libpth/loclibpth so it fails to find the libraries. Subsequently the libs are dropped from the build line for gcc and the build falls over during linking.
I have reproduced this on my system by grabbing the src-deb via 'apt-get source perl' both on the base system and in a pbuilder env..
The end result is a build failure
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cc -fstack-protector -L/usr/local/lib -o miniperl \
gv.o toke.o perly.o pad.o regcomp.o dump.o util.o mg.o reentr.o mro.o hv.o av.o run.o pp_hot.o sv.o pp.o scope.o pp_ctl.o pp_sys.o doop.o doio.o regexec.o utf8.o taint.
o deb.o universal.o xsutils.o globals.o perlio.o perlapi.o numeric.o mathoms.o locale.o pp_pack.o pp_sort.o \
miniperlmain.o opmini.o perlmini.o
util.o: In function `Perl_safesysmalloc':
/tmp/buildd/perl-5.10.1/util.c:78: undefined reference to `pthread_getspecific'
util.o: In function `Perl_safesysrealloc':
/tmp/buildd/perl-5.10.1/util.c:134: undefined reference to `pthread_getspecific'
util.o: In function `Perl_croak_nocontext':
/tmp/buildd/perl-5.10.1/util.c:1444: undefined reference to `pthread_getspecific'
util.o: In function `Perl_safesyscalloc':
/tmp/buildd/perl-5.10.1/util.c:271: undefined reference to `pthread_getspecific'
util.o: In function `Perl_die_nocontext':
...
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Under a normal build several libs should follow at the end of the build line, like '-lm'
I am sure there are other suitable fixes and possible debate if this should be made a 'default' search path but here is a potential fix none the less.