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+<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
+[<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
+<!--SPDX-License-Identifier: CC-BY-2.0-UK-->
+
+<chapter id='adt-package'>
+<title>Optionally Customizing the Development Packages Installation</title>
+
+    <para>
+        Because the Yocto Project is suited for embedded Linux development, it is
+        likely that you will need to customize your development packages installation.
+        For example, if you are developing a minimal image, then you might not need
+        certain packages (e.g. graphics support packages).
+        Thus, you would like to be able to remove those packages from your target sysroot.
+    </para>
+
+<section id='package-management-systems'>
+    <title>Package Management Systems</title>
+
+    <para>
+        The OpenEmbedded build system supports the generation of sysroot files using
+        three different Package Management Systems (PMS):
+        <itemizedlist>
+            <listitem><para><emphasis>OPKG:</emphasis> A less well known PMS whose use
+                originated in the OpenEmbedded and OpenWrt embedded Linux projects.
+                This PMS works with files packaged in an <filename>.ipk</filename> format.
+                See <ulink url='http://en.wikipedia.org/wiki/Opkg'></ulink> for more
+                information about OPKG.</para></listitem>
+            <listitem><para><emphasis>RPM:</emphasis> A more widely known PMS intended for GNU/Linux
+                distributions.
+                This PMS works with files packaged in an <filename>.rpm</filename> format.
+                The build system currently installs through this PMS by default.
+                See <ulink url='http://en.wikipedia.org/wiki/RPM_Package_Manager'></ulink>
+                for more information about RPM.</para></listitem>
+            <listitem><para><emphasis>Debian:</emphasis> The PMS for Debian-based systems
+                is built on many PMS tools.
+                The lower-level PMS tool <filename>dpkg</filename> forms the base of the Debian PMS.
+                For information on dpkg see
+                <ulink url='http://en.wikipedia.org/wiki/Dpkg'></ulink>.</para></listitem>
+        </itemizedlist>
+    </para>
+</section>
+
+<section id='configuring-the-pms'>
+    <title>Configuring the PMS</title>
+
+    <para>
+        Whichever PMS you are using, you need to be sure that the
+        <ulink url='&YOCTO_DOCS_REF_URL;#var-PACKAGE_CLASSES'><filename>PACKAGE_CLASSES</filename></ulink>
+        variable in the <filename>conf/local.conf</filename>
+        file is set to reflect that system.
+        The first value you choose for the variable specifies the package file format for the root
+        filesystem at sysroot.
+        Additional values specify additional formats for convenience or testing.
+        See the <filename>conf/local.conf</filename> configuration file for
+        details.
+    </para>
+
+    <note>
+        For build performance information related to the PMS, see the
+        "<ulink url='&YOCTO_DOCS_REF_URL;#ref-classes-package'><filename>package.bbclass</filename></ulink>"
+        section in the Yocto Project Reference Manual.
+    </note>
+
+    <para>
+        As an example, consider a scenario where you are using OPKG and you want to add
+        the <filename>libglade</filename> package to the target sysroot.
+    </para>
+
+    <para>
+        First, you should generate the IPK file for the
+        <filename>libglade</filename> package and add it
+        into a working <filename>opkg</filename> repository.
+        Use these commands:
+        <literallayout class='monospaced'>
+     $ bitbake libglade
+     $ bitbake package-index
+        </literallayout>
+    </para>
+
+    <para>
+        Next, source the cross-toolchain environment setup script found in the
+        <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>.
+        Follow that by setting up the installation destination to point to your
+        sysroot as <replaceable>sysroot_dir</replaceable>.
+        Finally, have an OPKG configuration file <replaceable>conf_file</replaceable>
+        that corresponds to the <filename>opkg</filename> repository you have just created.
+        The following command forms should now work:
+        <literallayout class='monospaced'>
+     $ opkg-cl –f <replaceable>conf_file</replaceable> -o <replaceable>sysroot_dir</replaceable> update
+     $ opkg-cl –f <replaceable>cconf_file</replaceable> -o <replaceable>sysroot_dir</replaceable> \
+        --force-overwrite install libglade
+     $ opkg-cl –f <replaceable>cconf_file</replaceable> -o <replaceable>sysroot_dir</replaceable> \
+        --force-overwrite install libglade-dbg
+     $ opkg-cl –f <replaceable>conf_file&gt; -o </replaceable>sysroot_dir&gt; \
+        --force-overwrite install libglade-dev
+        </literallayout>
+    </para>
+</section>
+</chapter>
+<!--
+vim: expandtab tw=80 ts=4
+-->