N_CS_PRECEDES
N_SEP_BY_SPACE
N_SIGN_POSN
NAME_MAX
NAN
NCCS
NDEBUG
NEGATIVE_SIGN
netgroup
networks
NEW_TIME
NGROUPS_MAX
NL_ARGMAX
NO_ADDRESS
NO_RECOVERY
NOEXPR
NOFLSH
NOKERNINFO
NOSTR
NSIG
NSS_STATUS_NOTFOUND
NSS_STATUS_SUCCESS
NSS_STATUS_TRYAGAIN
NSS_STATUS_UNAVAIL
NULL
O_ACCMODE
O_APPEND
O_ASYNC
O_CREAT
O_EXCL
O_EXEC
O_EXLOCK
O_FSYNC
O_IGNORE_CTTY
O_NDELAY
O_NOATIME
O_NOCTTY
O_NOLINK
O_NONBLOCK
O_NOTRANS
O_RDONLY
O_RDWR
O_READ
O_SHLOCK
O_SYNC
O_TRUNC
O_WRITE
O_WRONLY
obstack_alloc_failed_handler
OLD_TIME
ONLCR
ONOEOT
OPEN_MAX
OPOST
optarg
getopt
opterr
optind
OPTION_ALIAS
OPTION_ARG_OPTIONAL
OPTION_DOC
OPTION_HIDDEN
OPTION_NO_USAGE
optopt
OXTABS
P_CS_PRECEDES
P_SEP_BY_SPACE
P_SIGN_POSN
P_tmpdir
PA_CHAR
PA_DOUBLE
PA_FLAG_LONG
PA_FLAG_LONG_DOUBLE
PA_FLAG_LONG_LONG
PA_FLAG_MASK
PA_FLAG_PTR
PA_FLAG_SHORT
PA_FLOAT
PA_INT
PA_LAST
PA_POINTER
PA_STRING
PARENB
PARMRK
PARODD
passwd
PATH_MAX
PENDIN
PF_CCITT
PF_FILE
PF_IMPLINK
PF_INET
PF_INET6
PF_ISO
PF_LOCAL
PF_NS
PF_ROUTE
PF_UNIX
PI
PIPE_BUF
PM_STR
POSITIVE_SIGN
PRIO_MAX
PRIO_MIN
PRIO_PGRP
PRIO_PROCESS
PRIO_USER
program_invocation_name
program_invocation_short_name
PROT_EXEC
PROT_READ
PROT_WRITE
protocols
PWD