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d_msg_ctrunc (d_socket.U):
	This variable conditionally defines the HAS_MSG_CTRUNC symbol,
	which indicates that the MSG_CTRUNC is available.  #ifdef is
	not enough because it may be an enum, glibc has been known to do this.

d_msg_dontroute (d_socket.U):
	This variable conditionally defines the HAS_MSG_DONTROUTE symbol,
	which indicates that the MSG_DONTROUTE is available.  #ifdef is
	not enough because it may be an enum, glibc has been known to do this.

d_msg_oob (d_socket.U):
	This variable conditionally defines the HAS_MSG_OOB symbol,
	which indicates that the MSG_OOB is available.  #ifdef is
	not enough because it may be an enum, glibc has been known to do this.

d_msg_peek (d_socket.U):
	This variable conditionally defines the HAS_MSG_PEEK symbol,
	which indicates that the MSG_PEEK is available.  #ifdef is
	not enough because it may be an enum, glibc has been known to do this.

d_msg_proxy (d_socket.U):
	This variable conditionally defines the HAS_MSG_PROXY symbol,
	which indicates that the MSG_PROXY is available.  #ifdef is
	not enough because it may be an enum, glibc has been known to do this.

d_msgctl (d_msgctl.U):
	This variable conditionally defines the HAS_MSGCTL symbol, which
	indicates to the C program that the msgctl() routine is available.

d_msgget (d_msgget.U):
	This variable conditionally defines the HAS_MSGGET symbol, which
	indicates to the C program that the msgget() routine is available.

d_msghdr_s (d_msghdr_s.U):
	This variable conditionally defines the HAS_STRUCT_MSGHDR symbol,
	which indicates that the struct msghdr is supported.

d_msgrcv (d_msgrcv.U):
	This variable conditionally defines the HAS_MSGRCV symbol, which
	indicates to the C program that the msgrcv() routine is available.

d_msgsnd (d_msgsnd.U):
	This variable conditionally defines the HAS_MSGSND symbol, which
	indicates to the C program that the msgsnd() routine is available.

d_msync (d_msync.U):
	This variable conditionally defines HAS_MSYNC if msync() is
	available to synchronize a mapped file.

d_munmap (d_munmap.U):
	This variable conditionally defines HAS_MUNMAP if munmap() is
	available to unmap a region mapped by mmap().

d_mymalloc (mallocsrc.U):
	This variable conditionally defines MYMALLOC in case other parts
	of the source want to take special action if MYMALLOC is used.
	This may include different sorts of profiling or error detection.

d_nan (d_nan.U):
	This variable conditionally defines HAS_NAN if nan() is
	available to generate NaN.

d_nanosleep (d_nanosleep.U):
	This variable conditionally defines HAS_NANOSLEEP
	if nanosleep() is available to sleep with 1E-9 sec accuracy.

d_ndbm (i_ndbm.U):
	This variable conditionally defines the HAS_NDBM symbol, which
	indicates that both the ndbm.h include file and an appropriate ndbm
	library exist.  Consult the different i_*ndbm variables
	to find out the actual include location.  Sometimes, a system has the
	header file but not the library.  This variable will only be set if
	the system has both.

d_ndbm_h_uses_prototypes (i_ndbm.U):
	This variable conditionally defines the NDBM_H_USES_PROTOTYPES symbol,
	which indicates that the ndbm.h include file uses real ANSI C
	prototypes instead of K&R style function declarations. K&R style
	declarations are unsupported in C++, so the include file requires
	special handling when using a C++ compiler and this variable is
	undefined. Consult the different d_*ndbm_h_uses_prototypes variables
	to get the same information for alternative ndbm.h include files.

d_nearbyint (d_nearbyint.U):
	This variable conditionally defines HAS_NEARBYINT if nearbyint()
	is available to return the integral value closest to (according to
	the current rounding mode) to x.

d_newlocale (d_newlocale.U):
	This variable conditionally defines the HAS_NEWLOCALE symbol, which
	indicates to the C program that the newlocale() routine is available
	to return a new locale object or modify an existing locale object.

d_nextafter (d_nextafter.U):
	This variable conditionally defines HAS_NEXTAFTER if nextafter()
	is available to return the next machine representable double from
	x in direction y.

d_nexttoward (d_nexttoward.U):
	This variable conditionally defines HAS_NEXTTOWARD if nexttoward()
	is available to return the next machine representable long double from
	x in direction y.

d_nice (d_nice.U):
	This variable conditionally defines the HAS_NICE symbol, which
	indicates to the C program that the nice() routine is available.

d_nl_langinfo (d_nl_langinfo.U):
	This variable conditionally defines the HAS_NL_LANGINFO symbol, which
	indicates to the C program that the nl_langinfo() routine is available.

d_nl_langinfo_l (d_nl_langinfo_l.U):
	This variable contains the eventual value of the
	HAS_NL_LANGINFO_L symbol, which indicates if the
	nl_langinfo_l() function exists.

d_non_int_bitfields (d_bitfield.U):
	This variable conditionally defines HAS_NON_INT_BITFIELDS
	which indicates that the C compiler accepts struct bitfields of sizes
	that aren't 'int' or 'unsigned int'