config.pod

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which indicates to the C program that the crypt_r()
routine is available.

=item C<d_csh>

From F<d_csh.U>:

This variable conditionally defines the C<CSH> symbol, which
indicates to the C program that the C-shell exists.

=item C<d_ctermid>

From F<d_ctermid.U>:

This variable conditionally defines C<CTERMID> if ctermid() is
available to generate filename for terminal.

=item C<d_ctermid_r>

From F<d_ctermid_r.U>:

This variable conditionally defines the C<HAS_CTERMID_R> symbol,
which indicates to the C program that the ctermid_r()
routine is available.

=item C<d_ctime_r>

From F<d_ctime_r.U>:

This variable conditionally defines the C<HAS_CTIME_R> symbol,
which indicates to the C program that the ctime_r()
routine is available.

=item C<d_cuserid>

From F<d_cuserid.U>:

This variable conditionally defines the C<HAS_CUSERID> symbol, which
indicates to the C program that the cuserid() routine is available
to get character login names.

=item C<d_dbl_dig>

From F<d_dbl_dig.U>:

This variable conditionally defines d_dbl_dig if this system's
header files provide C<DBL_DIG>, which is the number of significant
digits in a double precision number.

=item C<d_dbminitproto>

From F<d_dbminitproto.U>:

This variable conditionally defines the C<HAS_DBMINIT_PROTO> symbol,
which indicates to the C program that the system provides
a prototype for the dbminit() function.  Otherwise, it is
up to the program to supply one.

=item C<d_difftime>

From F<d_difftime.U>:

This variable conditionally defines the C<HAS_DIFFTIME> symbol, which
indicates to the C program that the difftime() routine is available.

=item C<d_dir_dd_fd>

From F<d_dir_dd_fd.U>:

This variable conditionally defines the C<HAS_DIR_DD_FD> symbol, which
indicates that the C<DIR> directory stream type contains a member
variable called dd_fd.

=item C<d_dirfd>

From F<d_dirfd.U>:

This variable conditionally defines the C<HAS_DIRFD> constant,
which indicates to the C program that dirfd() is available
to return the file descriptor of a directory stream.

=item C<d_dirnamlen>

From F<i_dirent.U>:

This variable conditionally defines C<DIRNAMLEN>, which indicates
to the C program that the length of directory entry names is
provided by a d_namelen field.

=item C<d_dlerror>

From F<d_dlerror.U>:

This variable conditionally defines the C<HAS_DLERROR> symbol, which
indicates to the C program that the dlerror() routine is available.

=item C<d_dlopen>

From F<d_dlopen.U>:

This variable conditionally defines the C<HAS_DLOPEN> symbol, which
indicates to the C program that the dlopen() routine is available.

=item C<d_dlsymun>

From F<d_dlsymun.U>:

This variable conditionally defines C<DLSYM_NEEDS_UNDERSCORE>, which
indicates that we need to prepend an underscore to the symbol
name before calling dlsym().

=item C<d_dosuid>

From F<d_dosuid.U>:

This variable conditionally defines the symbol C<DOSUID>, which
tells the C program that it should insert setuid emulation code
on hosts which have setuid #! scripts disabled.

=item C<d_drand48_r>

From F<d_drand48_r.U>:

This variable conditionally defines the HAS_DRAND48_R symbol,
which indicates to the C program that the drand48_r()
routine is available.

=item C<d_drand48proto>

From F<d_drand48proto.U>:

This variable conditionally defines the HAS_DRAND48_PROTO symbol,
which indicates to the C program that the system provides
a prototype for the drand48() function.  Otherwise, it is
up to the program to supply one.

=item C<d_dup2>

From F<d_dup2.U>:

This variable conditionally defines HAS_DUP2 if dup2() is
available to duplicate file descriptors.

=item C<d_eaccess>

From F<d_eaccess.U>:

This variable conditionally defines the C<HAS_EACCESS> symbol, which
indicates to the C program that the eaccess() routine is available.

=item C<d_endgrent>

From F<d_endgrent.U>:

This variable conditionally defines the C<HAS_ENDGRENT> symbol, which
indicates to the C program that the endgrent() routine is available
for sequential access of the group database.

=item C<d_endgrent_r>

From F<d_endgrent_r.U>:

This variable conditionally defines the C<HAS_ENDGRENT_R> symbol,
which indicates to the C program that the endgrent_r()
routine is available.

=item C<d_endhent>

From F<d_endhent.U>:

This variable conditionally defines C<HAS_ENDHOSTENT> if endhostent() is
available to close whatever was being used for host queries.

=item C<d_endhostent_r>

From F<d_endhostent_r.U>:

This variable conditionally defines the C<HAS_ENDHOSTENT_R> symbol,
which indicates to the C program that the endhostent_r()
routine is available.

=item C<d_endnent>

From F<d_endnent.U>:

This variable conditionally defines C<HAS_ENDNETENT> if endnetent() is
available to close whatever was being used for network queries.

=item C<d_endnetent_r>

From F<d_endnetent_r.U>:

This variable conditionally defines the C<HAS_ENDNETENT_R> symbol,
which indicates to the C program that the endnetent_r()
routine is available.

=item C<d_endpent>

From F<d_endpent.U>:

This variable conditionally defines C<HAS_ENDPROTOENT> if endprotoent() is
available to close whatever was being used for protocol queries.

=item C<d_endprotoent_r>

From F<d_endprotoent_r.U>:

This variable conditionally defines the C<HAS_ENDPROTOENT_R> symbol,
which indicates to the C program that the endprotoent_r()
routine is available.

=item C<d_endpwent>

From F<d_endpwent.U>:

This variable conditionally defines the C<HAS_ENDPWENT> symbol, which
indicates to the C program that the endpwent() routine is available
for sequential access of the passwd database.

=item C<d_endpwent_r>

From F<d_endpwent_r.U>:

This variable conditionally defines the C<HAS_ENDPWENT_R> symbol,
which indicates to the C program that the endpwent_r()
routine is available.

=item C<d_endsent>

From F<d_endsent.U>:

This variable conditionally defines C<HAS_ENDSERVENT> if endservent() is
available to close whatever was being used for service queries.

=item C<d_endservent_r>

From F<d_endservent_r.U>:

This variable conditionally defines the C<HAS_ENDSERVENT_R> symbol,
which indicates to the C program that the endservent_r()
routine is available.

=item C<d_eofnblk>

From F<nblock_io.U>:

This variable conditionally defines C<EOF_NONBLOCK> if C<EOF> can be seen
when reading from a non-blocking I/O source.

=item C<d_eunice>

From F<Guess.U>:

This variable conditionally defines the symbols C<EUNICE> and C<VAX>, which
alerts the C program that it must deal with ideosyncracies of C<VMS>.

=item C<d_faststdio>

From F<d_faststdio.U>:

This variable conditionally defines the C<HAS_FAST_STDIO> symbol,
which indicates to the C program that the "fast stdio" is available
to manipulate the stdio buffers directly.

=item C<d_fchdir>

From F<d_fchdir.U>:

This variable conditionally defines the C<HAS_FCHDIR> symbol, which
indicates to the C program that the fchdir() routine is available.

=item C<d_fchmod>

From F<d_fchmod.U>:

This variable conditionally defines the C<HAS_FCHMOD> symbol, which
indicates to the C program that the fchmod() routine is available
to change mode of opened files.

=item C<d_fchown>

From F<d_fchown.U>:

This variable conditionally defines the C<HAS_FCHOWN> symbol, which
indicates to the C program that the fchown() routine is available
to change ownership of opened files.

=item C<d_fcntl>

From F<d_fcntl.U>:

This variable conditionally defines the C<HAS_FCNTL> symbol, and indicates
whether the fcntl() function exists

=item C<d_fcntl_can_lock>

From F<d_fcntl_can_lock.U>:

This variable conditionally defines the C<FCNTL_CAN_LOCK> symbol
and indicates whether file locking with fcntl() works.

=item C<d_fd_macros>

From F<d_fd_set.U>:

This variable contains the eventual value of the C<HAS_FD_MACROS> symbol,
which indicates if your C compiler knows about the macros which
manipulate an fd_set.

=item C<d_fd_set>

From F<d_fd_set.U>:

This variable contains the eventual value of the C<HAS_FD_SET> symbol,
which indicates if your C compiler knows about the fd_set typedef.

=item C<d_fds_bits>

From F<d_fd_set.U>:

This variable contains the eventual value of the C<HAS_FDS_BITS> symbol,
which indicates if your fd_set typedef contains the fds_bits member.
If you have an fd_set typedef, but the dweebs who installed it did
a half-fast job and neglected to provide the macros to manipulate
an fd_set, C<HAS_FDS_BITS> will let us know how to fix the gaffe.

=item C<d_fgetpos>

From F<d_fgetpos.U>:

This variable conditionally defines C<HAS_FGETPOS> if fgetpos() is
available to get the file position indicator.

=item C<d_finite>

From F<d_finite.U>:

This variable conditionally defines the C<HAS_FINITE> symbol, which
indicates to the C program that the finite() routine is available.

=item C<d_finitel>

From F<d_finitel.U>:

This variable conditionally defines the C<HAS_FINITEL> symbol, which
indicates to the C program that the finitel() routine is available.

=item C<d_flexfnam>

From F<d_flexfnam.U>:

This variable conditionally defines the C<FLEXFILENAMES> symbol, which
indicates that the system supports filenames longer than 14 characters.

=item C<d_flock>

From F<d_flock.U>:

This variable conditionally defines C<HAS_FLOCK> if flock() is
available to do file locking.

=item C<d_flockproto>

From F<d_flockproto.U>:

This variable conditionally defines the C<HAS_FLOCK_PROTO> symbol,
which indicates to the C program that the system provides
a prototype for the flock() function.  Otherwise, it is
up to the program to supply one.

=item C<d_fork>

From F<d_fork.U>:

This variable conditionally defines the C<HAS_FORK> symbol, which
indicates to the C program that the fork() routine is available.

=item C<d_fp_class>

From F<d_fp_class.U>:

This variable conditionally defines the C<HAS_FP_CLASS> symbol, which
indicates to the C program that the fp_class() routine is available.

=item C<d_fpathconf>

From F<d_pathconf.U>:

This variable conditionally defines the C<HAS_FPATHCONF> symbol, which
indicates to the C program that the pathconf() routine is available
to determine file-system related limits and options associated
with a given open file descriptor.

=item C<d_fpclass>

From F<d_fpclass.U>:

This variable conditionally defines the C<HAS_FPCLASS> symbol, which
indicates to the C program that the fpclass() routine is available.

=item C<d_fpclassify>

From F<d_fpclassify.U>:

This variable conditionally defines the C<HAS_FPCLASSIFY> symbol, which
indicates to the C program that the fpclassify() routine is available.

=item C<d_fpclassl>

From F<d_fpclassl.U>:

This variable conditionally defines the C<HAS_FPCLASSL> symbol, which
indicates to the C program that the fpclassl() routine is available.

=item C<d_fpos64_t>

From F<d_fpos64_t.U>:

This symbol will be defined if the C compiler supports fpos64_t.

=item C<d_frexpl>

From F<d_frexpl.U>:

This variable conditionally defines the C<HAS_FREXPL> symbol, which
indicates to the C program that the frexpl() routine is available.

=item C<d_fs_data_s>

From F<d_fs_data_s.U>:

This variable conditionally defines the C<HAS_STRUCT_FS_DATA> symbol,
which indicates that the struct fs_data is supported.

=item C<d_fseeko>

From F<d_fseeko.U>:

This variable conditionally defines the C<HAS_FSEEKO> symbol, which
indicates to the C program that the fseeko() routine is available.

=item C<d_fsetpos>

From F<d_fsetpos.U>:

This variable conditionally defines C<HAS_FSETPOS> if fsetpos() is
available to set the file position indicator.

=item C<d_fstatfs>

From F<d_fstatfs.U>:

This variable conditionally defines the C<HAS_FSTATFS> symbol, which
indicates to the C program that the fstatfs() routine is available.

=item C<d_fstatvfs>

From F<d_statvfs.U>:

This variable conditionally defines the C<HAS_FSTATVFS> symbol, which
indicates to the C program that the fstatvfs() routine is available.

=item C<d_fsync>

From F<d_fsync.U>:

This variable conditionally defines the C<HAS_FSYNC> symbol, which
indicates to the C program that the fsync() routine is available.

=item C<d_ftello>

From F<d_ftello.U>:

This variable conditionally defines the C<HAS_FTELLO> symbol, which
indicates to the C program that the ftello() routine is available.

=item C<d_ftime>

From F<d_ftime.U>:

This variable conditionally defines the C<HAS_FTIME> symbol, which indicates
that the ftime() routine exists.  The ftime() routine is basically
a sub-second accuracy clock.

=item C<d_futimes>

From F<d_futimes.U>:

This variable conditionally defines the C<HAS_FUTIMES> symbol, which
indicates to the C program that the futimes() routine is available.

=item C<d_Gconvert>

From F<d_gconvert.U>:

This variable holds what Gconvert is defined as to convert
floating point numbers into strings.  By default, Configure