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+.. SPDX-License-Identifier: CC-BY-2.0-UK
+
+************************************************************
+Optionally Customizing the Development Packages Installation
+************************************************************
+
+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.
+
+Package Management Systems
+==========================
+
+The OpenEmbedded build system supports the generation of sysroot files
+using three different Package Management Systems (PMS):
+
+-  *OPKG:* A less well known PMS whose use originated in the
+   OpenEmbedded and OpenWrt embedded Linux projects. This PMS works with
+   files packaged in an ``.ipk`` format. See
+   http://en.wikipedia.org/wiki/Opkg for more information about
+   OPKG.
+
+-  *RPM:* A more widely known PMS intended for GNU/Linux distributions.
+   This PMS works with files packaged in an ``.rpm`` format. The build
+   system currently installs through this PMS by default. See
+   http://en.wikipedia.org/wiki/RPM_Package_Manager for more
+   information about RPM.
+
+-  *Debian:* The PMS for Debian-based systems is built on many PMS
+   tools. The lower-level PMS tool ``dpkg`` forms the base of the Debian
+   PMS. For information on dpkg see
+   http://en.wikipedia.org/wiki/Dpkg.
+
+Configuring the PMS
+===================
+
+Whichever PMS you are using, you need to be sure that the
+:term:`PACKAGE_CLASSES`
+variable in the ``conf/local.conf`` 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
+``conf/local.conf`` configuration file for details.
+
+.. note::
+
+   For build performance information related to the PMS, see the "
+   package.bbclass
+   " section in the Yocto Project Reference Manual.
+
+As an example, consider a scenario where you are using OPKG and you want
+to add the ``libglade`` package to the target sysroot.
+
+First, you should generate the IPK file for the ``libglade`` package and
+add it into a working ``opkg`` repository. Use these commands: $ bitbake
+libglade $ bitbake package-index
+
+Next, source the cross-toolchain environment setup script found in the
+:term:`Source Directory`. Follow
+that by setting up the installation destination to point to your sysroot
+as sysroot_dir. Finally, have an OPKG configuration file conf_file that
+corresponds to the ``opkg`` repository you have just created. The
+following command forms should now work: $ opkg-cl –f conf_file -o
+sysroot_dir update $ opkg-cl –f cconf_file -o sysroot_dir \\
+--force-overwrite install libglade $ opkg-cl –f cconf_file -o
+sysroot_dir \\ --force-overwrite install libglade-dbg $ opkg-cl –f
+conf_file> -osysroot_dir> \\ --force-overwrite install libglade-dev