This autoupdate patch: http://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=3a5aa57f6651255916ae05c44aa3a75086c1e285
copied an old version of glibc/time/mktime.c to gnulib/lib/mktime.c. I just now reverted that change, to restore the latest version. Karl, are you mirroring glibc master? Here's how to get its latest version set up: git clone git://sourceware.org/git/glibc.git