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<title>Apache Server Frequently Asked Questions</title>
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<h1 align="CENTER">Apache Server Frequently Asked
Questions</h1>
<p>$Revision: 1.99 $ ($Date: 2010/12/10 10:13:45 $)</p>
<p><b>Please note that this document refers to a version of the
product which has been deprecated, and declared "end of life", in
favor of the <a href="http://httpd.apache.org/docs/current">more recent
version of the server</a>. Information obtained here is likely to be
outdated and inaccurate.</b></p>
<p>The latest version of this FAQ is available on the HTTP Server
Wiki, at <<a href="http://wiki.apache.org/httpd/FAQ" rel="Help"
><samp>http://httpd.apache.org/docs/1.3/misc/FAQ.html</samp></a>>.
This version is no longer maintained, and contains inaccurate
and grossly outdated information.</p>
<!-- Notes about changes: Don't make any. Make them in the wiki. -->
<h2>The Questions</h2>
<ol type="A">
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<li value="3">
<strong>Building Apache</strong>
<ol>
<li><a href="#bind8.1">Why do I get an error about an
undefined reference to "<samp>__inet_ntoa</samp>" or
other <samp>__inet_*</samp> symbols?</a></li>
<li><a href="#cantbuild">Why won't Apache compile with my
system's <samp>cc</samp>?</a></li>
<li><a href="#linuxiovec">Why do I get complaints about
redefinition of "<code>struct iovec</code>" when
compiling under Linux?</a></li>
<li><a href="#broken-gcc">I'm using gcc and I get some
compilation errors, what is wrong?</a></li>
<li><a href="#glibc-crypt">I'm using RedHat Linux 5.0, or
some other <samp>glibc</samp>-based Linux system, and I
get errors with the <code>crypt</code> function when I
attempt to build Apache 1.2.</a></li>
</ol>
</li>
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</ol>
<hr />
<h2>The Answers</h2>
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<h3>C. Building Apache</h3>
<ol>
<li>
<a id="bind8.1" name="bind8.1"><strong>Why do I get an
error about an undefined reference to
"<samp>__inet_ntoa</samp>" or other <samp>__inet_*</samp>
symbols?</strong></a>
<p>If you have installed <a
href="http://www.isc.org/bind.html">BIND-8</a> then this is
normally due to a conflict between your include files and
your libraries. BIND-8 installs its include files and
libraries <code>/usr/local/include/</code> and
<code>/usr/local/lib/</code>, while the resolver that comes
with your system is probably installed in
<code>/usr/include/</code> and <code>/usr/lib/</code>. If
your system uses the header files in
<code>/usr/local/include/</code> before those in
<code>/usr/include/</code> but you do not use the new
resolver library, then the two versions will conflict.</p>
<p>To resolve this, you can either make sure you use the
include files and libraries that came with your system or
make sure to use the new include files and libraries.
Adding <code>-lbind</code> to the
<code>EXTRA_LDFLAGS</code> line in your
<samp>Configuration</samp> file, then re-running
<samp>Configure</samp>, should resolve the problem. (Apache
versions 1.2.* and earlier use <code>EXTRA_LFLAGS</code>
instead.)</p>
<p><strong>Note:</strong>As of BIND 8.1.1, the bind
libraries and files are installed under
<samp>/usr/local/bind</samp> by default, so you should not
run into this problem. Should you want to use the bind
resolvers you'll have to add the following to the
respective lines:</p>
<dl>
<dd><code>EXTRA_CFLAGS=-I/usr/local/bind/include<br />
EXTRA_LDFLAGS=-L/usr/local/bind/lib<br />
EXTRA_LIBS=-lbind</code></dd>
</dl>
<hr />
</li>
<li>
<a id="cantbuild" name="cantbuild"><strong>Why won't Apache
compile with my system's <samp>cc</samp>?</strong></a>
<p>If the server won't compile on your system, it is
probably due to one of the following causes:</p>
<ul>
<li><strong>The <samp>Configure</samp> script doesn't
recognize your system environment.</strong><br />
This might be either because it's completely unknown or
because the specific environment (include files, OS
version, <em>et cetera</em>) isn't explicitly handled. If
this happens, you may need to port the server to your OS
yourself.</li>
<li><strong>Your system's C compiler is
garbage.</strong><br />
Some operating systems include a default C compiler that
is either not ANSI C-compliant or suffers from other
deficiencies. The usual recommendation in cases like this
is to acquire, install, and use <samp>gcc</samp>.</li>
<li><strong>Your <samp>include</samp> files may be
confused.</strong><br />
In some cases, we have found that a compiler
installation or system upgrade has left the C header
files in an inconsistent state. Make sure that your
include directory tree is in sync with the compiler and
the operating system.</li>
<li><strong>Your operating system or compiler may be out
of revision.</strong><br />
Software vendors (including those that develop operating
systems) issue new releases for a reason; sometimes to
add functionality, but more often to fix bugs that have
been discovered. Try upgrading your compiler and/or your
operating system.</li>
</ul>
<p>The Apache Group tests the ability to build the server
on many different platforms. Unfortunately, we can't test
all of the OS platforms there are. If you have verified
that none of the above issues is the cause of your problem,
and it hasn't been reported before, please submit a <a
href="http://httpd.apache.org/bug_report.html">problem
report</a>. Be sure to include <em>complete</em> details,
such as the compiler & OS versions and exact error
messages.</p>
<hr />
</li>
<li>
<a id="linuxiovec" name="linuxiovec"><strong>Why do I get
complaints about redefinition of "<code>struct
iovec</code>" when compiling under Linux?</strong></a>
<p>This is a conflict between your C library includes and
your kernel includes. You need to make sure that the
versions of both are matched properly. There are two
workarounds, either one will solve the problem:</p>
<ul>
<li>Remove the definition of <code>struct iovec</code>
from your C library includes. It is located in
<code>/usr/include/sys/uio.h</code>.
<strong>Or,</strong></li>
<li>Add <code>-DNO_WRITEV</code> to the
<code>EXTRA_CFLAGS</code> line in your
<samp>Configuration</samp> and reconfigure/rebuild. This
hurts performance and should only be used as a last
resort.</li>
</ul>
<hr />
</li>
<li>
<a id="broken-gcc" name="broken-gcc"><strong>I'm using gcc
and I get some compilation errors, what is
wrong?</strong></a>
<p>GCC parses your system header files and produces a
modified subset which it uses for compiling. This behavior
ties GCC tightly to the version of your operating system.
So, for example, if you were running IRIX 5.3 when you
built GCC and then upgrade to IRIX 6.2 later, you will have
to rebuild GCC. Similarly for Solaris 2.4, 2.5, or 2.5.1
when you upgrade to 2.6. Sometimes you can type "gcc -v"
and it will tell you the version of the operating system it
was built against.</p>
<p>If you fail to do this, then it is very likely that
Apache will fail to build. One of the most common errors is
with <code>readv</code>, <code>writev</code>, or
<code>uio.h</code>. This is <strong>not</strong> a bug with
Apache. You will need to re-install GCC.</p>
<hr />
</li>
<li>
<a id="glibc-crypt" name="glibc-crypt"><strong>I'm using
RedHat Linux 5.0, or some other <samp>glibc</samp>-based
Linux system, and I get errors with the <code>crypt</code>
function when I attempt to build Apache 1.2.</strong></a>
<p><samp>glibc</samp> puts the <code>crypt</code> function
into a separate library. Edit your
<code>src/Configuration</code> file and set this:</p>
<dl>
<dd><code>EXTRA_LIBS=-lcrypt</code></dd>
</dl>
<p>Then re-run <samp>src/Configure</samp> and re-execute
the make.</p>
<hr />
</li>
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