inttypes.h

Conversion functions for wide-char strings are missing:

intmax_t wcstoimax(const wchar_t *restrict, wchar_t **restrict, int);
uintmax_t wcstoumax(const wchar_t *restrict, wchar_t **restrict, int);

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langinfo.h

The locale variant of nl_langinfo() is missing:

char *nl_langinfo_l(nl_item, locale_t);

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libgen.h is fine.

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limits.h appears to miss a large number of definitions, but this
behaviour is in fact fine as long as the missing limits are indeterminate
in Haiku.

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locale.h

The following bitmasks for newlocale() are missing:

LC_COLLATE_MASK,
LC_CTYPE_MASK,
LC_MESSAGES_MASK,
LC_MONETARY_MASK,
LC_NUMERIC_MASK,
LC_TIME_MASK,
and LC_ALL_MASK, which combines them all.

The locale_t type, which represents a locale object, is missing.

LC_GLOBAL_LOCALE, which is used by uselocale(), should be defined
as a unique object of type locale_t.

The following function declarations are missing:

locale_t duplocale(locale_t);
void freelocale(locale_t);
locale_t newlocale(int, const char *, locale_t);
locale_t uselocale (locale_t);

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monetary.h

The locale variant of strfmon() is missing:

ssize_t strfmon_l(char *restrict, size_t, locale_t, const char *restrict, ...);

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netdb.h is fine.

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poll.h is fine.

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pthread.h 

The following symbolic constants are missing:

PTHREAD_MUTEX_ROBUST
PTHREAD_MUTEX_STALLED
PTHREAD_INHERIT_SCHED

PTHREAD_RWLOCK_INITIALIZER is missing, and should expand to an
expression suitable to initialize the pthread_rwlock_t type.

The following types are missing:

pthread_barrier_t
pthread_barrierattr_t

The following function declarations are missing:

int pthread_mutex_consistent(pthread_mutex_t *);
int pthread_mutexattr_getrobust(const pthread_mutexattr_t *restrict, int *restrict);
int pthread_mutexattr_setrobust(pthread_mutexattr_t *, int);
int pthread_condattr_getclock(const pthread_condattr_t *restrict, clockid_t *restrict);
int pthread_condattr_setclock(pthread_condattr_t *, clockid_t);
int pthread_getcpuclockid(pthread_t, clockid_t *);
int pthread_setschedprio(pthread_t, int);

as are all the barrier functions:

int pthread_barrier_destroy(pthread_barrier_t *);
int pthread_barrier_init(pthread_barrier_t *restrict, 
    const pthread_barrierattr_t *restrict, unsigned);
int pthread_barrier_wait(pthread_barrier_t *);
int pthread_barrierattr_destroy(pthread_barrierattr_t *);
int pthread_barrierattr_getpshared(const pthread_barrierattr_t *restrict, int *restrict);
int pthread_barrierattr_init(pthread_barrierattr_t *);
int pthread_barrierattr_setpshared(pthread_barrierattr_t *, int);

and all the commented out pthread_attr_* functions.

pthread_kill() should be moved to signal.h.

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pwd.h is fine.

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ivonv.h, iso646.h, mqueue.h, and ndbm.h are missing.