/usr/share/doc/libc-dev-bin/NAMESPACE is in libc-dev-bin 2.23-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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aio.h aio_, lio_, AIO_, LIO_
complex.h cerf{,f,l}, cerfc{,f,l}, cexp2{,f,l},
cexpm1{,f,l}, clog10{,f,l}, clog1p{,f,l},
clog2{,f,l}, clgamma{,f,l}, ctgamma{,f,l}
ctype.h is[a-z], to[a-z]
dirent.h d_
dlfcn.h RTLD_
errno.h E
fcntl.h l_, F_, O_, S_
fmtmsg.h MM_
fnmatch.h FNM_
ftw.h FTW
glob.h gl_, GLOB_
grp.h gr_
inttypes.h PRI[a-zX], SCN[a-zX]
limits.h _MAX
locale.h LC_[A-Z]
mqueue.h mq_, MQ_
ndbm.h dbm_, DBM_
nl_types.h NL_
poll.h pd_, ph_, ps_, POLL
pthread.h pthread_, PTHREAD_
pwd.h pw_
regex.h re_, rm_, REG_
sched.h sched_, SCHED_
semaphore.h sem_, SEM_
signal.h sa_, uc_, SIG[A-Z], SIG_[A-Z], SIG_[0-9a-z_]
ss_, sv_
si_, SI_, sigev_, SIGEV_, sival_, SA_,
BUS_, CLD_, FPE_, ILL_, POLL_, SEGV_, SS_, SV_, TRAP_
stdint.h int*_t, uint*_t, INT*_MAX, INT*_MIN,
INT*_C, UINT*_MAX, UINT*_MIN, UINT*_C
stdlib.h str[a-z]
string.h str[a-z], wcs[a-z]
stropts.h bi_, ic_, l_, sl_, str_,
FLUSH[A-Z], I_, M_, MUXID_R[A-Z], S_, SND[A-Z], STR
syslog.h LOG_
sys/ipc.h ipc_, IPC_
sys/mman.h shm_, MAP_, MCL_, MS_, PROT_
sys/msg.h msg, MSG[A-Z], MSG_[A-Z]
sys/resource.h rlim_, ru_, PRIO_, RLIM_, RLIMIT_, RUSAGE_
sys/sem.h sem, SEM_
sys/shm.h shm, SHM[A-Z], SHM_[A-Z]
sys/socket.h AF_, MSG_, PF_, SO
sys/stat.h st_, S_
sys/statvfs.h f_, ST_
sys/time.h fds_, it_, tv_, FD_, ITIMER_
sys/times.h tms_
sys/uio.h iov_, IOV_
sys/utsname.h uts_
sys/wait.h si_, W[A-Z], P_,
BUS_, CLD_, FPE_, ILL_, POLL_, SEGV_, SI_, TRAP_
termios.h c_, V, I, O, TC, B[0-9]
time.h tm_
clock_, timer_, it_, tv_,
CLOCK_, TIMER_
ucontext.h uc_, SS_
ulimit.h UL_
utime.h utim_
utmpx.h ut_ _LVL, _TIME, _PROCESS
wchar.h wcs[a-z]
wctype.h is[a-z], to[a-z]
wordexp.h we_, WRDE_
ANY header _t
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