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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HEAD>
<TITLE>Apache Server Frequently Asked Questions</TITLE>
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<H1 ALIGN="CENTER">Apache Server Frequently Asked Questions</H1>
<P>
$Revision: 1.1 $ ($Date: 1999/06/24 15:02:51 $)
</P>
<P>
The latest version of this FAQ is always available from the main
Apache web site, at
<<A
HREF="http://www.apache.org/docs/misc/FAQ.html"
REL="Help"
><SAMP>http://www.apache.org/docs/misc/FAQ.html</SAMP></A>>.
</P>
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<P>
If you are reading a text-only version of this FAQ, you may find numbers
enclosed in brackets (such as "[12]"). These refer to the list of
reference URLs to be found at the end of the document. These references
do not appear, and are not needed, for the hypertext version.
</P>
<H2>The Questions</H2>
<OL TYPE="A">
<!--#endif -->
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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>
<!--#endif -->
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</OL>
<HR>
<H2>The Answers</H2>
<!--#endif -->
<!--#if expr="! $TOC" -->
<H3>C. Building Apache</H3>
<OL>
<LI><A 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>
<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>
<P></P>
<HR>
</LI>
<LI><A 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://www.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 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>
<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>
<P></P>
<HR>
</LI>
<LI><A 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 behaviour 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 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>
</OL>
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