make configuring+building away from source directory work (VPATH et al)
_r support
cross-compilation configuring
- mmap support
POSIX 1003.1 1996 Edition support
Locales
- locales across packages
- decimal separator (3,1415927 is Europeanese for an approximation of pi)
+ locales across packages?
Regexen
POSIX [=bar=] and [.zap.] would nice too but there's no API for them