"locale"

real regerror

Try to improve code size and quality with __restrict__.

FPU exception handling (for mawk)

res_mkquery should not assume op is QUERY

logging.

EINTR handling (*puke*).  What about EAGAIN?

gethost/netent -> parselib

Look at qsort (the make test suite exhibits the worst case)

Make __dtostr do scientific notation.
fix %g in printf.  They are more or less completely b0rken (in
  particular rounding the last digit does not work).

qmail-queue dumps core since we added vfork.  Editing fork.h to #define
  vfork to fork works.  What happens here?

use TCP if buf[2]&2 is non-zero in DNS answers.

look at mktime: "Falls tm_isdst == -1 gesetzt, so sollte mktime
versuchen herauszufinden, ob Sommerzeit eingestellt ist (und laut linux
manpage auch tzname setzen), ansonsten die angegebene DST
berücksichtigen."

remove strings.h?  Matthias Andree says it confuses
  AC_CHECK_HEADERS([strings.h]) from autoconf.

better rand()?

try to make zebra compile.

getdents64 needs large file backwards compatibility as well (?)