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            <h1><a href="../index.html">MIT Kerberos Documentation</a></h1>
            
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  <div class="section" id="options-to-configure">
<span id="options2configure"></span><h1>Options to <em>configure</em><a class="headerlink" href="#options-to-configure" title="Permalink to this headline">¶</a></h1>
<p>There are a number of options to configure which you can use to
control how the Kerberos distribution is built.</p>
<div class="section" id="most-commonly-used-options">
<h2>Most commonly used options<a class="headerlink" href="#most-commonly-used-options" title="Permalink to this headline">¶</a></h2>
<dl class="docutils">
<dt><strong>-</strong><strong>-help</strong></dt>
<dd>Provides help to configure.  This will list the set of commonly
used options for building Kerberos.</dd>
<dt><strong>-</strong><strong>-prefix=</strong><em>PREFIX</em></dt>
<dd>By default, Kerberos will install the package&#8217;s files rooted at
<tt class="docutils literal"><span class="pre">/usr/local</span></tt>.  If you desire to place the binaries into the
directory <em>PREFIX</em>, use this option.</dd>
<dt><strong>-</strong><strong>-exec-prefix=</strong><em>EXECPREFIX</em></dt>
<dd>This option allows one to separate the architecture independent
programs from the host-dependent files (configuration files,
manual pages).  Use this option to install architecture-dependent
programs in <em>EXECPREFIX</em>.  The default location is the value of
specified by <strong>-</strong><strong>-prefix</strong> option.</dd>
<dt><strong>-</strong><strong>-localstatedir=</strong><em>LOCALSTATEDIR</em></dt>
<dd>This option sets the directory for locally modifiable
single-machine data.  In Kerberos, this mostly is useful for
setting a location for the KDC data files, as they will be
installed in <tt class="docutils literal"><span class="pre">LOCALSTATEDIR/krb5kdc</span></tt>, which is by default
<tt class="docutils literal"><span class="pre">PREFIX/var/krb5kdc</span></tt>.</dd>
<dt><strong>-</strong><strong>-with-netlib</strong>[=<em>libs</em>]</dt>
<dd>Allows for suppression of or replacement of network libraries.  By
default, Kerberos V5 configuration will look for <tt class="docutils literal"><span class="pre">-lnsl</span></tt> and
<tt class="docutils literal"><span class="pre">-lsocket</span></tt>.  If your operating system has a broken resolver
library or fails to pass the tests in <tt class="docutils literal"><span class="pre">src/tests/resolv</span></tt>, you
will need to use this option.</dd>
<dt><strong>-</strong><strong>-with-tcl=</strong><em>TCLPATH</em></dt>
<dd>Some of the unit-tests in the build tree rely upon using a program
in Tcl.  The directory specified by <em>TCLPATH</em> specifies where the
Tcl header file (TCLPATH/include/tcl.h) as well as where the Tcl
library (TCLPATH/lib) should be found.</dd>
<dt><strong>-</strong><strong>-enable-dns-for-realm</strong></dt>
<dd>Enable the use of DNS to look up a host&#8217;s Kerberos realm,
if the information is not provided in
<a class="reference internal" href="../admin/conf_files/krb5_conf.html#krb5-conf-5"><em>krb5.conf</em></a>.  See <a class="reference internal" href="../admin/realm_config.html#mapping-hostnames"><em>Mapping hostnames onto Kerberos realms</em></a>
for information about using DNS to determine the default realm.
DNS lookups for realm names are disabled by default.</dd>
<dt><strong>-</strong><strong>-with-system-et</strong></dt>
<dd><p class="first">Use an installed version of the error-table (et) support software,
the compile_et program, the com_err.h header file and the com_err
library.  If these are not in the default locations, you may wish
to specify <tt class="docutils literal"><span class="pre">CPPFLAGS=-I/some/dir</span></tt> and
<tt class="docutils literal"><span class="pre">LDFLAGS=-L/some/other/dir</span></tt> options at configuration time as
well.</p>
<p class="last">If this option is not given, a version supplied with the Kerberos
sources will be built and installed along with the rest of the
Kerberos tree, for Kerberos applications to link against.</p>
</dd>
<dt><strong>-</strong><strong>-with-system-ss</strong></dt>
<dd><p class="first">Use an installed version of the subsystem command-line interface
software, the mk_cmds program, the <tt class="docutils literal"><span class="pre">ss/ss.h</span></tt> header file and the
ss library.  If these are not in the default locations, you may
wish to specify <tt class="docutils literal"><span class="pre">CPPFLAGS=-I/some/dir</span></tt> and
<tt class="docutils literal"><span class="pre">LDFLAGS=-L/some/other/dir</span></tt> options at configuration time as
well.  See also the <strong>SS_LIB</strong> option.</p>
<p class="last">If this option is not given, the ss library supplied with the
Kerberos sources will be compiled and linked into those programs
that need it; it will not be installed separately.</p>
</dd>
<dt><strong>-</strong><strong>-with-system-db</strong></dt>
<dd><p class="first">Use an installed version of the Berkeley DB package, which must
provide an API compatible with version 1.85.  This option is
unsupported and untested.  In particular, we do not know if the
database-rename code used in the dumpfile load operation will
behave properly.</p>
<p class="last">If this option is not given, a version supplied with the Kerberos
sources will be built and installed.  (We are not updating this
version at this time because of licensing issues with newer
versions that we haven&#8217;t investigated sufficiently yet.)</p>
</dd>
</dl>
</div>
<div class="section" id="environment-variables">
<h2>Environment variables<a class="headerlink" href="#environment-variables" title="Permalink to this headline">¶</a></h2>
<dl class="docutils">
<dt><strong>CC=</strong><em>COMPILER</em></dt>
<dd>Use <em>COMPILER</em> as the C compiler.</dd>
<dt><strong>CFLAGS=</strong><em>FLAGS</em></dt>
<dd>Use <em>FLAGS</em> as the default set of C compiler flags.</dd>
<dt><strong>CPP=</strong><em>CPP</em></dt>
<dd>C preprocessor to use. (e.g., <tt class="docutils literal"><span class="pre">CPP='gcc</span> <span class="pre">-E'</span></tt>)</dd>
<dt><strong>CPPFLAGS=</strong><em>CPPOPTS</em></dt>
<dd>Use <em>CPPOPTS</em> as the default set of C preprocessor flags.  The
most common use of this option is to select certain #define&#8217;s for
use with the operating system&#8217;s include files.</dd>
<dt><strong>DB_HEADER=</strong><em>headername</em></dt>
<dd>If db.h is not the correct header file to include to compile
against the Berkeley DB 1.85 API, specify the correct header file
name with this option. For example, <tt class="docutils literal"><span class="pre">DB_HEADER=db3/db_185.h</span></tt>.</dd>
<dt><strong>DB_LIB=</strong><em>libs</em>...</dt>
<dd>If <tt class="docutils literal"><span class="pre">-ldb</span></tt> is not the correct library specification for the
Berkeley DB library version to be used, override it with this
option. For example, <tt class="docutils literal"><span class="pre">DB_LIB=-ldb-3.3</span></tt>.</dd>
<dt><strong>DEFCCNAME=</strong><em>ccachename</em></dt>
<dd>Override the built-in default credential cache name.
For example, <tt class="docutils literal"><span class="pre">DEFCCNAME=DIR:/var/run/user/%{USERID}/ccache</span></tt>
See <a class="reference internal" href="../admin/conf_files/krb5_conf.html#parameter-expansion"><em>Parameter expansion</em></a> for information about supported
parameter expansions.</dd>
<dt><strong>DEFCKTNAME=</strong><em>keytabname</em></dt>
<dd>Override the built-in default client keytab name.
The format is the same as for <em>DEFCCNAME</em>.</dd>
<dt><strong>DEFKTNAME=</strong><em>keytabname</em></dt>
<dd>Override the built-in default keytab name.
The format is the same as for <em>DEFCCNAME</em>.</dd>
<dt><strong>LD=</strong><em>LINKER</em></dt>
<dd>Use <em>LINKER</em> as the default loader if it should be different from
C compiler as specified above.</dd>
<dt><strong>LDFLAGS=</strong><em>LDOPTS</em></dt>
<dd>This option informs the linker where to get additional libraries
(e.g., <tt class="docutils literal"><span class="pre">-L&lt;lib</span> <span class="pre">dir&gt;</span></tt>).</dd>
<dt><strong>LIBS=</strong><em>LDNAME</em></dt>
<dd>This option allows one to specify libraries to be passed to the
linker (e.g., <tt class="docutils literal"><span class="pre">-l&lt;library&gt;</span></tt>)</dd>
<dt><strong>SS_LIB=</strong><em>libs</em>...</dt>
<dd><p class="first">If <tt class="docutils literal"><span class="pre">-lss</span></tt> is not the correct way to link in your installed ss
library, for example if additional support libraries are needed,
specify the correct link options here.  Some variants of this
library are around which allow for Emacs-like line editing, but
different versions require different support libraries to be
explicitly specified.</p>
<p class="last">This option is ignored if <strong>-</strong><strong>-with-system-ss</strong> is not specified.</p>
</dd>
<dt><strong>YACC</strong></dt>
<dd>The &#8216;Yet Another C Compiler&#8217; implementation to use. Defaults to
the first program found out of: &#8216;<cite>bison -y</cite>&#8216;, &#8216;<cite>byacc</cite>&#8216;,
&#8216;<cite>yacc</cite>&#8216;.</dd>
<dt><strong>YFLAGS</strong></dt>
<dd>The list of arguments that will be passed by default to $YACC.
This script will default YFLAGS to the empty string to avoid a
default value of <tt class="docutils literal"><span class="pre">-d</span></tt> given by some make applications.</dd>
</dl>
</div>
<div class="section" id="fine-tuning-of-the-installation-directories">
<h2>Fine tuning of the installation directories<a class="headerlink" href="#fine-tuning-of-the-installation-directories" title="Permalink to this headline">¶</a></h2>
<dl class="docutils">
<dt><strong>-</strong><strong>-bindir=</strong><em>DIR</em></dt>
<dd>User executables.  Defaults to <tt class="docutils literal"><span class="pre">EXECPREFIX/bin</span></tt>, where
<em>EXECPREFIX</em> is the path specified by <strong>-</strong><strong>-exec-prefix</strong>
configuration option.</dd>
<dt><strong>-</strong><strong>-sbindir=</strong><em>DIR</em></dt>
<dd>System admin executables.  Defaults to <tt class="docutils literal"><span class="pre">EXECPREFIX/sbin</span></tt>, where
<em>EXECPREFIX</em> is the path specified by <strong>-</strong><strong>-exec-prefix</strong>
configuration option.</dd>
<dt><strong>-</strong><strong>-sysconfdir=</strong><em>DIR</em></dt>
<dd>Read-only single-machine data such as krb5.conf.
Defaults to <tt class="docutils literal"><span class="pre">PREFIX/etc</span></tt>, where
<em>PREFIX</em> is the path specified by <strong>-</strong><strong>-prefix</strong> configuration
option.</dd>
<dt><strong>-</strong><strong>-libdir=</strong><em>DIR</em></dt>
<dd>Object code libraries.  Defaults to <tt class="docutils literal"><span class="pre">EXECPREFIX/lib</span></tt>, where
<em>EXECPREFIX</em> is the path specified by <strong>-</strong><strong>-exec-prefix</strong>
configuration option.</dd>
<dt><strong>-</strong><strong>-includedir=</strong><em>DIR</em></dt>
<dd>C header files.  Defaults to <tt class="docutils literal"><span class="pre">PREFIX/include</span></tt>, where <em>PREFIX</em> is
the path specified by <strong>-</strong><strong>-prefix</strong> configuration option.</dd>
<dt><strong>-</strong><strong>-datarootdir=</strong><em>DATAROOTDIR</em></dt>
<dd>Read-only architecture-independent data root.  Defaults to
<tt class="docutils literal"><span class="pre">PREFIX/share</span></tt>, where <em>PREFIX</em> is the path specified by
<strong>-</strong><strong>-prefix</strong> configuration option.</dd>
<dt><strong>-</strong><strong>-datadir=</strong><em>DIR</em></dt>
<dd>Read-only architecture-independent data.  Defaults to path
specified by <strong>-</strong><strong>-datarootdir</strong> configuration option.</dd>
<dt><strong>-</strong><strong>-localedir=</strong><em>DIR</em></dt>
<dd>Locale-dependent data.  Defaults to <tt class="docutils literal"><span class="pre">DATAROOTDIR/locale</span></tt>, where
<em>DATAROOTDIR</em> is the path specified by <strong>-</strong><strong>-datarootdir</strong>
configuration option.</dd>
<dt><strong>-</strong><strong>-mandir=</strong><em>DIR</em></dt>
<dd>Man documentation.  Defaults to <tt class="docutils literal"><span class="pre">DATAROOTDIR/man</span></tt>, where
<em>DATAROOTDIR</em> is the path specified by <strong>-</strong><strong>-datarootdir</strong>
configuration option.</dd>
</dl>
</div>
<div class="section" id="program-names">
<h2>Program names<a class="headerlink" href="#program-names" title="Permalink to this headline">¶</a></h2>
<dl class="docutils">
<dt><strong>-</strong><strong>-program-prefix=</strong><em>PREFIX</em></dt>
<dd>Prepend <em>PREFIX</em> to the names of the programs when installing
them. For example, specifying <tt class="docutils literal"><span class="pre">--program-prefix=mit-</span></tt> at the
configure time will cause the program named <tt class="docutils literal"><span class="pre">abc</span></tt> to be
installed as <tt class="docutils literal"><span class="pre">mit-abc</span></tt>.</dd>
<dt><strong>-</strong><strong>-program-suffix=</strong><em>SUFFIX</em></dt>
<dd>Append <em>SUFFIX</em> to the names of the programs when installing them.
For example, specifying <tt class="docutils literal"><span class="pre">--program-suffix=-mit</span></tt> at the configure
time will cause the program named <tt class="docutils literal"><span class="pre">abc</span></tt> to be installed as
<tt class="docutils literal"><span class="pre">abc-mit</span></tt>.</dd>
<dt><strong>-</strong><strong>-program-transform-name=</strong><em>PROGRAM</em></dt>
<dd>Run <tt class="docutils literal"><span class="pre">sed</span> <span class="pre">-e</span> <span class="pre">PROGRAM</span></tt> on installed program names. (<em>PROGRAM</em> is a
sed script).</dd>
</dl>
</div>
<div class="section" id="system-types">
<h2>System types<a class="headerlink" href="#system-types" title="Permalink to this headline">¶</a></h2>
<dl class="docutils">
<dt><strong>-</strong><strong>-build=</strong><em>BUILD</em></dt>
<dd>Configure for building on <em>BUILD</em>
(e.g., <tt class="docutils literal"><span class="pre">--build=x86_64-linux-gnu</span></tt>).</dd>
<dt><strong>-</strong><strong>-host=</strong><em>HOST</em></dt>
<dd>Cross-compile to build programs to run on <em>HOST</em>
(e.g., <tt class="docutils literal"><span class="pre">--host=x86_64-linux-gnu</span></tt>).  By default, Kerberos V5
configuration will look for &#8220;build&#8221; option.</dd>
</dl>
</div>
<div class="section" id="optional-features">
<h2>Optional features<a class="headerlink" href="#optional-features" title="Permalink to this headline">¶</a></h2>
<dl class="docutils">
<dt><strong>-</strong><strong>-disable-option-checking</strong></dt>
<dd>Ignore unrecognized &#8211;enable/&#8211;with options.</dd>
<dt><strong>-</strong><strong>-disable-</strong><em>FEATURE</em></dt>
<dd>Do not include <em>FEATURE</em> (same as &#8211;enable-FEATURE=no).</dd>
<dt><strong>-</strong><strong>-enable-</strong><em>FEATURE</em>[=<em>ARG</em>]</dt>
<dd>Include <em>FEATURE</em> [ARG=yes].</dd>
<dt><strong>-</strong><strong>-enable-maintainer-mode</strong></dt>
<dd>Enable rebuilding of source files, Makefiles, etc.</dd>
<dt><strong>-</strong><strong>-disable-delayed-initialization</strong></dt>
<dd>Initialize library code when loaded.  Defaults to delay until
first use.</dd>
<dt><strong>-</strong><strong>-disable-thread-support</strong></dt>
<dd>Don&#8217;t enable thread support.  Defaults to enabled.</dd>
<dt><strong>-</strong><strong>-disable-rpath</strong></dt>
<dd>Suppress run path flags in link lines.</dd>
<dt><strong>-</strong><strong>-enable-athena</strong></dt>
<dd>Build with MIT Project Athena configuration.</dd>
<dt><strong>-</strong><strong>-disable-kdc-lookaside-cache</strong></dt>
<dd>Disable the cache which detects client retransmits.</dd>
<dt><strong>-</strong><strong>-disable-pkinit</strong></dt>
<dd>Disable PKINIT plugin support.</dd>
<dt><strong>-</strong><strong>-disable-aesni</strong></dt>
<dd>Disable support for using AES instructions on x86 platforms.</dd>
<dt><strong>-</strong><strong>-enable-asan</strong>[=<em>ARG</em>]</dt>
<dd>Enable building with asan memory error checking.  If <em>ARG</em> is
given, it controls the -fsanitize compilation flag value (the
default is &#8220;address&#8221;).</dd>
</dl>
</div>
<div class="section" id="optional-packages">
<h2>Optional packages<a class="headerlink" href="#optional-packages" title="Permalink to this headline">¶</a></h2>
<dl class="docutils">
<dt><strong>-</strong><strong>-with-</strong><em>PACKAGE</em>[=ARG]</dt>
<dd>Use <em>PACKAGE</em> (e.g., <tt class="docutils literal"><span class="pre">--with-imap</span></tt>).  The default value of <em>ARG</em>
is <tt class="docutils literal"><span class="pre">yes</span></tt>.</dd>
<dt><strong>-</strong><strong>-without-</strong><em>PACKAGE</em></dt>
<dd>Do not use <em>PACKAGE</em> (same as <tt class="docutils literal"><span class="pre">--with-PACKAGE=no</span></tt>)
(e.g., <tt class="docutils literal"><span class="pre">--without-libedit</span></tt>).</dd>
<dt><strong>-</strong><strong>-with-size-optimizations</strong></dt>
<dd>Enable a few optimizations to reduce code size possibly at some
run-time cost.</dd>
<dt><strong>-</strong><strong>-with-system-et</strong></dt>
<dd>Use the com_err library and compile_et utility that are already
installed on the system, instead of building and installing
local versions.</dd>
<dt><strong>-</strong><strong>-with-system-ss</strong></dt>
<dd>Use the ss library and mk_cmds utility that are already installed
on the system, instead of building and using private versions.</dd>
<dt><strong>-</strong><strong>-with-system-db</strong></dt>
<dd>Use the berkeley db utility already installed on the system,
instead of using a private version.  This option is not
recommended; enabling it may result in incompatibility with key
databases originating on other systems.</dd>
<dt><strong>-</strong><strong>-with-netlib=</strong><em>LIBS</em></dt>
<dd>Use the resolver library specified in <em>LIBS</em>.  Use this variable
if the C library resolver is insufficient or broken.</dd>
<dt><strong>-</strong><strong>-with-hesiod=</strong><em>path</em></dt>
<dd>Compile with Hesiod support.  The <em>path</em> points to the Hesiod
directory.  By default Hesiod is unsupported.</dd>
<dt><strong>-</strong><strong>-with-ldap</strong></dt>
<dd>Compile OpenLDAP database backend module.</dd>
<dt><strong>-</strong><strong>-with-tcl=</strong><em>path</em></dt>
<dd>Specifies that <em>path</em> is the location of a Tcl installation.
Tcl is needed for some of the tests run by &#8216;make check&#8217;; such tests
will be skipped if this option is not set.</dd>
<dt><strong>-</strong><strong>-with-vague-errors</strong></dt>
<dd>Do not send helpful errors to client.  For example, if the KDC
should return only vague error codes to clients.</dd>
<dt><strong>-</strong><strong>-with-crypto-impl=</strong><em>IMPL</em></dt>
<dd>Use specified crypto implementation (e.g., <strong>-</strong><strong>-with-crypto-impl=</strong><em>openssl</em>).  The default is the native MIT
Kerberos implementation <tt class="docutils literal"><span class="pre">builtin</span></tt>.  The other currently
implemented crypto backend is <tt class="docutils literal"><span class="pre">openssl</span></tt>.  (See
<a class="reference internal" href="../mitK5features.html#mitk5features"><em>MIT Kerberos features</em></a>)</dd>
<dt><strong>-</strong><strong>-with-prng-alg=</strong><em>ALG</em></dt>
<dd>Use specified PRNG algorithm.  For example, to use the OS native
prng specify <tt class="docutils literal"><span class="pre">--with-prng-alg=os</span></tt>.  The default is <tt class="docutils literal"><span class="pre">fortuna</span></tt>.
(See <a class="reference internal" href="../mitK5features.html#mitk5features"><em>MIT Kerberos features</em></a>)</dd>
<dt><strong>-</strong><strong>-with-pkinit-crypto-impl=</strong><em>IMPL</em></dt>
<dd>Use the specified pkinit crypto implementation <em>IMPL</em>.
Defaults to using OpenSSL.</dd>
<dt><strong>-</strong><strong>-without-libedit</strong></dt>
<dd>Do not compile and link against libedit.  Some utilities will no
longer offer command history or completion in interactive mode if
libedit is disabled.</dd>
<dt><strong>-</strong><strong>-with-readline</strong></dt>
<dd>Compile and link against GNU readline, as an alternative to libedit.
Building with readline breaks the dejagnu test suite, which is a
subset of the tests run by &#8216;make check&#8217;.</dd>
<dt><strong>-</strong><strong>-with-system-verto</strong></dt>
<dd><p class="first">Use an installed version of libverto.  If the libverto header and
library are not in default locations, you may wish to specify
<tt class="docutils literal"><span class="pre">CPPFLAGS=-I/some/dir</span></tt> and <tt class="docutils literal"><span class="pre">LDFLAGS=-L/some/other/dir</span></tt> options
at configuration time as well.</p>
<p>If this option is not given, the build system will try to detect
an installed version of libverto and use it if it is found.
Otherwise, a version supplied with the Kerberos sources will be
built and installed.  The built-in version does not contain the
full set of back-end modules and is not a suitable general
replacement for the upstream version, but will work for the
purposes of Kerberos.</p>
<p class="last">Specifying <strong>-</strong><strong>-without-system-verto</strong> will cause the built-in
version of libverto to be used unconditionally.</p>
</dd>
<dt><strong>-</strong><strong>-with-krb5-config=</strong><em>PATH</em></dt>
<dd>Use the krb5-config program at <em>PATH</em> to obtain the build-time
default credential cache, keytab, and client keytab names.  The
default is to use <tt class="docutils literal"><span class="pre">krb5-config</span></tt> from the program path.  Specify
<tt class="docutils literal"><span class="pre">--without-krb5-config</span></tt> to disable the use of krb5-config and
use the usual built-in defaults.</dd>
</dl>
</div>
<div class="section" id="examples">
<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2>
<p>For example, in order to configure Kerberos on a Solaris machine using
the suncc compiler with the optimizer turned on, run the configure
script with the following options:</p>
<div class="highlight-python"><pre>% ./configure CC=suncc CFLAGS=-O</pre>
</div>
<p>For a slightly more complicated example, consider a system where
several packages to be used by Kerberos are installed in
<tt class="docutils literal"><span class="pre">/usr/foobar</span></tt>, including Berkeley DB 3.3, and an ss library that
needs to link against the curses library.  The configuration of
Kerberos might be done thus:</p>
<div class="highlight-python"><pre>./configure CPPFLAGS=-I/usr/foobar/include LDFLAGS=-L/usr/foobar/lib \
--with-system-et --with-system-ss --with-system-db  \
SS_LIB='-lss -lcurses'  DB_HEADER=db3/db_185.h DB_LIB=-ldb-3.3</pre>
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<li><a class="reference internal" href="#">Options to <em>configure</em></a><ul>
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<li><a class="reference internal" href="#environment-variables">Environment variables</a></li>
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<li class="toctree-l1 current"><a class="reference internal" href="index.html">Building Kerberos V5</a><ul class="current">
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