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</dd>
</li>
<dt><strong><a name="item_d_endnent"><code>d_endnent</code></a></strong>

<dd>
<p>From <em>d_endnent.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines <code>HAS_ENDNETENT</code> if <a href="../lib/Pod/perlfunc.html#item_endnetent"><code>endnetent()</code></a> is
available to close whatever was being used for network queries.</p>
</dd>
</li>
<dt><strong><a name="item_d_endnetent_r"><code>d_endnetent_r</code></a></strong>

<dd>
<p>From <em>d_endnetent_r.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_ENDNETENT_R</code> symbol,
which indicates to the C program that the <code>endnetent_r()</code>
routine is available.</p>
</dd>
</li>
<dt><strong><a name="item_d_endpent"><code>d_endpent</code></a></strong>

<dd>
<p>From <em>d_endpent.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines <code>HAS_ENDPROTOENT</code> if <a href="../lib/Pod/perlfunc.html#item_endprotoent"><code>endprotoent()</code></a> is
available to close whatever was being used for protocol queries.</p>
</dd>
</li>
<dt><strong><a name="item_d_endprotoent_r"><code>d_endprotoent_r</code></a></strong>

<dd>
<p>From <em>d_endprotoent_r.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_ENDPROTOENT_R</code> symbol,
which indicates to the C program that the <code>endprotoent_r()</code>
routine is available.</p>
</dd>
</li>
<dt><strong><a name="item_d_endpwent"><code>d_endpwent</code></a></strong>

<dd>
<p>From <em>d_endpwent.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_ENDPWENT</code> symbol, which
indicates to the C program that the <a href="../lib/Pod/perlfunc.html#item_endpwent"><code>endpwent()</code></a> routine is available
for sequential access of the passwd database.</p>
</dd>
</li>
<dt><strong><a name="item_d_endpwent_r"><code>d_endpwent_r</code></a></strong>

<dd>
<p>From <em>d_endpwent_r.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_ENDPWENT_R</code> symbol,
which indicates to the C program that the <code>endpwent_r()</code>
routine is available.</p>
</dd>
</li>
<dt><strong><a name="item_d_endsent"><code>d_endsent</code></a></strong>

<dd>
<p>From <em>d_endsent.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines <code>HAS_ENDSERVENT</code> if <a href="../lib/Pod/perlfunc.html#item_endservent"><code>endservent()</code></a> is
available to close whatever was being used for service queries.</p>
</dd>
</li>
<dt><strong><a name="item_d_endservent_r"><code>d_endservent_r</code></a></strong>

<dd>
<p>From <em>d_endservent_r.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_ENDSERVENT_R</code> symbol,
which indicates to the C program that the <code>endservent_r()</code>
routine is available.</p>
</dd>
</li>
<dt><strong><a name="item_d_eofnblk"><code>d_eofnblk</code></a></strong>

<dd>
<p>From <em>nblock_io.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines <code>EOF_NONBLOCK</code> if <code>EOF</code> can be seen
when reading from a non-blocking I/O source.</p>
</dd>
</li>
<dt><strong><a name="item_d_eunice"><code>d_eunice</code></a></strong>

<dd>
<p>From <em>Guess.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the symbols <code>EUNICE</code> and <code>VAX</code>, which
alerts the C program that it must deal with ideosyncracies of <a href="../lib/Pod/perlrun.html#item_vms"><code>VMS</code></a>.</p>
</dd>
</li>
<dt><strong><a name="item_d_faststdio"><code>d_faststdio</code></a></strong>

<dd>
<p>From <em>d_faststdio.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_FAST_STDIO</code> symbol,
which indicates to the C program that the &quot;fast stdio&quot; is available
to manipulate the stdio buffers directly.</p>
</dd>
</li>
<dt><strong><a name="item_d_fchdir"><code>d_fchdir</code></a></strong>

<dd>
<p>From <em>d_fchdir.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_FCHDIR</code> symbol, which
indicates to the C program that the <code>fchdir()</code> routine is available.</p>
</dd>
</li>
<dt><strong><a name="item_d_fchmod"><code>d_fchmod</code></a></strong>

<dd>
<p>From <em>d_fchmod.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_FCHMOD</code> symbol, which
indicates to the C program that the <code>fchmod()</code> routine is available
to change mode of opened files.</p>
</dd>
</li>
<dt><strong><a name="item_d_fchown"><code>d_fchown</code></a></strong>

<dd>
<p>From <em>d_fchown.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_FCHOWN</code> symbol, which
indicates to the C program that the <code>fchown()</code> routine is available
to change ownership of opened files.</p>
</dd>
</li>
<dt><strong><a name="item_d_fcntl"><code>d_fcntl</code></a></strong>

<dd>
<p>From <em>d_fcntl.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_FCNTL</code> symbol, and indicates
whether the <a href="../lib/Pod/perlfunc.html#item_fcntl"><code>fcntl()</code></a> function exists</p>
</dd>
</li>
<dt><strong><a name="item_d_fcntl_can_lock"><code>d_fcntl_can_lock</code></a></strong>

<dd>
<p>From <em>d_fcntl_can_lock.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>FCNTL_CAN_LOCK</code> symbol
and indicates whether file locking with <a href="../lib/Pod/perlfunc.html#item_fcntl"><code>fcntl()</code></a> works.</p>
</dd>
</li>
<dt><strong><a name="item_d_fd_macros"><code>d_fd_macros</code></a></strong>

<dd>
<p>From <em>d_fd_set.U</em>:</p>
</dd>
<dd>
<p>This variable contains the eventual value of the <code>HAS_FD_MACROS</code> symbol,
which indicates if your C compiler knows about the macros which
manipulate an fd_set.</p>
</dd>
</li>
<dt><strong><a name="item_d_fd_set"><code>d_fd_set</code></a></strong>

<dd>
<p>From <em>d_fd_set.U</em>:</p>
</dd>
<dd>
<p>This variable contains the eventual value of the <code>HAS_FD_SET</code> symbol,
which indicates if your C compiler knows about the fd_set typedef.</p>
</dd>
</li>
<dt><strong><a name="item_d_fds_bits"><code>d_fds_bits</code></a></strong>

<dd>
<p>From <em>d_fd_set.U</em>:</p>
</dd>
<dd>
<p>This variable contains the eventual value of the <code>HAS_FDS_BITS</code> 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, <code>HAS_FDS_BITS</code> will let us know how to fix the gaffe.</p>
</dd>
</li>
<dt><strong><a name="item_d_fgetpos"><code>d_fgetpos</code></a></strong>

<dd>
<p>From <em>d_fgetpos.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines <code>HAS_FGETPOS</code> if <code>fgetpos()</code> is
available to get the file position indicator.</p>
</dd>
</li>
<dt><strong><a name="item_d_finite"><code>d_finite</code></a></strong>

<dd>
<p>From <em>d_finite.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_FINITE</code> symbol, which
indicates to the C program that the <code>finite()</code> routine is available.</p>
</dd>
</li>
<dt><strong><a name="item_d_finitel"><code>d_finitel</code></a></strong>

<dd>
<p>From <em>d_finitel.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_FINITEL</code> symbol, which
indicates to the C program that the <code>finitel()</code> routine is available.</p>
</dd>
</li>
<dt><strong><a name="item_d_flexfnam"><code>d_flexfnam</code></a></strong>

<dd>
<p>From <em>d_flexfnam.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>FLEXFILENAMES</code> symbol, which
indicates that the system supports filenames longer than 14 characters.</p>
</dd>
</li>
<dt><strong><a name="item_d_flock"><code>d_flock</code></a></strong>

<dd>
<p>From <em>d_flock.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines <code>HAS_FLOCK</code> if <a href="../lib/Pod/perlfunc.html#item_flock"><code>flock()</code></a> is
available to do file locking.</p>
</dd>
</li>
<dt><strong><a name="item_d_flockproto"><code>d_flockproto</code></a></strong>

<dd>
<p>From <em>d_flockproto.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_FLOCK_PROTO</code> symbol,
which indicates to the C program that the system provides
a prototype for the <a href="../lib/Pod/perlfunc.html#item_flock"><code>flock()</code></a> function.  Otherwise, it is
up to the program to supply one.</p>
</dd>
</li>
<dt><strong><a name="item_d_fork"><code>d_fork</code></a></strong>

<dd>
<p>From <em>d_fork.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_FORK</code> symbol, which
indicates to the C program that the <a href="../lib/Pod/perlfunc.html#item_fork"><code>fork()</code></a> routine is available.</p>
</dd>
</li>
<dt><strong><a name="item_d_fp_class"><code>d_fp_class</code></a></strong>

<dd>
<p>From <em>d_fp_class.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_FP_CLASS</code> symbol, which
indicates to the C program that the <code>fp_class()</code> routine is available.</p>
</dd>
</li>
<dt><strong><a name="item_d_fpathconf"><code>d_fpathconf</code></a></strong>

<dd>
<p>From <em>d_pathconf.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_FPATHCONF</code> symbol, which
indicates to the C program that the <code>pathconf()</code> routine is available
to determine file-system related limits and options associated
with a given open file descriptor.</p>
</dd>
</li>
<dt><strong><a name="item_d_fpclass"><code>d_fpclass</code></a></strong>

<dd>
<p>From <em>d_fpclass.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_FPCLASS</code> symbol, which
indicates to the C program that the <code>fpclass()</code> routine is available.</p>
</dd>
</li>
<dt><strong><a name="item_d_fpclassify"><code>d_fpclassify</code></a></strong>

<dd>
<p>From <em>d_fpclassify.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_FPCLASSIFY</code> symbol, which
indicates to the C program that the <code>fpclassify()</code> routine is available.</p>
</dd>
</li>
<dt><strong><a name="item_d_fpclassl"><code>d_fpclassl</code></a></strong>

<dd>
<p>From <em>d_fpclassl.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_FPCLASSL</code> symbol, which
indicates to the C program that the <code>fpclassl()</code> routine is available.</p>
</dd>
</li>
<dt><strong><a name="item_d_fpos64_t"><code>d_fpos64_t</code></a></strong>

<dd>
<p>From <em>d_fpos64_t.U</em>:</p>
</dd>
<dd>
<p>This symbol will be defined if the C compiler supports fpos64_t.</p>
</dd>
</li>
<dt><strong><a name="item_d_frexpl"><code>d_frexpl</code></a></strong>

<dd>
<p>From <em>d_frexpl.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_FREXPL</code> symbol, which
indicates to the C program that the <code>frexpl()</code> routine is available.</p>
</dd>
</li>
<dt><strong><a name="item_d_fs_data_s"><code>d_fs_data_s</code></a></strong>

<dd>
<p>From <em>d_fs_data_s.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_STRUCT_FS_DATA</code> symbol,
which indicates that the struct fs_data is supported.</p>
</dd>
</li>
<dt><strong><a name="item_d_fseeko"><code>d_fseeko</code></a></strong>

<dd>
<p>From <em>d_fseeko.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_FSEEKO</code> symbol, which
indicates to the C program that the <code>fseeko()</code> routine is available.</p>
</dd>
</li>
<dt><strong><a name="item_d_fsetpos"><code>d_fsetpos</code></a></strong>

<dd>
<p>From <em>d_fsetpos.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines <code>HAS_FSETPOS</code> if <code>fsetpos()</code> is
available to set the file position indicator.</p>
</dd>
</li>
<dt><strong><a name="item_d_fstatfs"><code>d_fstatfs</code></a></strong>

<dd>
<p>From <em>d_fstatfs.U</em>:</p>
</dd>
<dd>
<p>This variable conditionally defines the <code>HAS_FSTATFS</code> symbol, which
indicates to the C program that the <code>fstatfs()</code> routine is available.</p>
</dd>
</li>
<dt><strong><a name="item_d_fstatvfs"><code>d_fstatvfs</code></a></strong>

<dd>
<p>From <em>d_statvfs.U</