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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='faq'>
+<title>FAQ</title>
+<qandaset>
+    <qandaentry>
+        <question>
+            <para>
+                How does Poky differ from <ulink url='&OE_HOME_URL;'>OpenEmbedded</ulink>?
+            </para>
+        </question>
+        <answer>
+            <para>
+                The term "<link link='poky'>Poky</link>"
+                refers to the specific reference build system that
+                the Yocto Project provides.
+                Poky is based on <link linkend='oe-core'>OE-Core</link>
+                and <link linkend='bitbake-term'>BitBake</link>.
+                Thus, the generic term used here for the build system is
+                the "OpenEmbedded build system."
+                Development in the Yocto Project using Poky is closely tied to OpenEmbedded, with
+                changes always being merged to OE-Core or BitBake first before being pulled back
+                into Poky.
+                This practice benefits both projects immediately.
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para id='faq-not-meeting-requirements'>
+                My development system does not meet the
+                required Git, tar, and Python versions.
+                In particular, I do not have Python 3.5.0 or greater.
+                Can I still use the Yocto Project?
+            </para>
+        </question>
+        <answer>
+            <para>
+                You can get the required tools on your host development
+                system a couple different ways (i.e. building a tarball or
+                downloading a tarball).
+                See the
+                "<link linkend='required-git-tar-python-and-gcc-versions'>Required Git, tar, Python and gcc Versions</link>"
+                section for steps on how to update your build tools.
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para>
+                How can you claim Poky / OpenEmbedded-Core is stable?
+            </para>
+        </question>
+        <answer>
+            <para>
+                There are three areas that help with stability;
+                <itemizedlist>
+                    <listitem><para>The Yocto Project team keeps
+                        <link linkend='oe-core'>OE-Core</link> small
+                        and focused, containing around 830 recipes as opposed to the thousands
+                        available in other OpenEmbedded community layers.
+                        Keeping it small makes it easy to test and maintain.</para></listitem>
+                    <listitem><para>The Yocto Project team runs manual and automated tests
+                        using a small, fixed set of reference hardware as well as emulated
+                        targets.</para></listitem>
+                    <listitem><para>The Yocto Project uses an autobuilder,
+                        which provides continuous build and integration tests.</para></listitem>
+                </itemizedlist>
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para>
+                How do I get support for my board added to the Yocto Project?
+            </para>
+        </question>
+        <answer>
+            <para>
+                Support for an additional board is added by creating a
+                Board Support Package (BSP) layer for it.
+                For more information on how to create a BSP layer, see the
+                "<ulink url='&YOCTO_DOCS_DEV_URL;#understanding-and-creating-layers'>Understanding and Creating Layers</ulink>"
+                section in the Yocto Project Development Tasks Manual and the
+                <ulink url='&YOCTO_DOCS_BSP_URL;'>Yocto Project Board Support Package (BSP) Developer's Guide</ulink>.
+            </para>
+            <para>
+                Usually, if the board is not completely exotic, adding support in
+                the Yocto Project is fairly straightforward.
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para>
+                Are there any products built using the OpenEmbedded build system?
+            </para>
+        </question>
+        <answer>
+            <para>
+                The software running on the <ulink url='http://vernier.com/labquest/'>Vernier LabQuest</ulink>
+                is built using the OpenEmbedded build system.
+                See the <ulink url='http://www.vernier.com/products/interfaces/labq/'>Vernier LabQuest</ulink>
+                website for more information.
+                There are a number of pre-production devices using the OpenEmbedded build system
+                and the Yocto Project team
+                announces them as soon as they are released.
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para>
+                What does the OpenEmbedded build system produce as output?
+            </para>
+        </question>
+        <answer>
+            <para>
+                Because you can use the same set of recipes to create output of
+                various formats, the output of an OpenEmbedded build depends on
+                how you start it.
+                Usually, the output is a flashable image ready for the target
+                device.
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para>
+                How do I add my package to the Yocto Project?
+            </para>
+        </question>
+        <answer>
+            <para>
+                To add a package, you need to create a BitBake recipe.
+                For information on how to create a BitBake recipe, see the
+                "<ulink url='&YOCTO_DOCS_DEV_URL;#new-recipe-writing-a-new-recipe'>Writing a New Recipe</ulink>"
+                section in the Yocto Project Development Tasks Manual.
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para>
+                Do I have to reflash my entire board with a new Yocto Project image when recompiling
+                a package?
+            </para>
+        </question>
+        <answer>
+            <para>
+                The OpenEmbedded build system can build packages in various
+                formats such as IPK for OPKG, Debian package
+                (<filename>.deb</filename>), or RPM.
+                You can then upgrade the packages using the package tools on
+                the device, much like on a desktop distribution such as
+                Ubuntu or Fedora.
+                However, package management on the target is entirely optional.
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para>
+                I see the error '<filename>chmod: XXXXX new permissions are r-xrwxrwx, not r-xr-xr-x</filename>'.
+                What is wrong?
+            </para>
+        </question>
+        <answer>
+            <para>
+                You are probably running the build on an NTFS filesystem.
+                Use <filename>ext2</filename>, <filename>ext3</filename>, or <filename>ext4</filename> instead.
+            </para>
+        </answer>
+    </qandaentry>
+
+<!--    <qandaentry>
+        <question>
+            <para>
+                How do I make the Yocto Project work in RHEL/CentOS?
+            </para>
+        </question>
+        <answer>
+            <para>
+                To get the Yocto Project working under RHEL/CentOS 5.1 you need to first
+                install some required packages.
+                The standard CentOS packages needed are:
+                <itemizedlist>
+                    <listitem><para>"Development tools" (selected during installation)</para></listitem>
+                    <listitem><para><filename>texi2html</filename></para></listitem>
+                    <listitem><para><filename>compat-gcc-34</filename></para></listitem>
+                </itemizedlist>
+                On top of these, you need the following external packages:
+                <itemizedlist>
+                    <listitem><para><filename>python-sqlite2</filename> from
+                        <ulink url='http://dag.wieers.com/rpm/packages/python-sqlite2/'>DAG repository</ulink>
+                        </para></listitem>
+                    <listitem><para><filename>help2man</filename> from
+                        <ulink url='http://centos.karan.org/el4/extras/stable/x86_64/RPMS/repodata/repoview/help2man-0-1.33.1-2.html'>Karan repository</ulink></para></listitem>
+                </itemizedlist>
+            </para>
+
+            <para>
+                Once these packages are installed, the OpenEmbedded build system will be able
+                to build standard images.
+                However, there might be a problem with the QEMU emulator segfaulting.
+                You can either disable the generation of binary locales by setting
+                <filename><link linkend='var-ENABLE_BINARY_LOCALE_GENERATION'>ENABLE_BINARY_LOCALE_GENERATION</link>
+                </filename> to "0" or by removing the <filename>linux-2.6-execshield.patch</filename>
+                from the kernel and rebuilding it since that is the patch that causes the problems with QEMU.
+            </para>
+
+            <note>
+                <para>For information on distributions that the Yocto Project
+                uses during validation, see the
+                <ulink url='&YOCTO_WIKI_URL;/wiki/Distribution_Support'>Distribution Support</ulink>
+                Wiki page.</para>
+                <para>For notes about using the Yocto Project on a RHEL 4-based
+                host, see the
+                <ulink url='&YOCTO_WIKI_URL;/wiki/BuildingOnRHEL4'>Building on RHEL4</ulink>
+                Wiki page.</para>
+            </note>
+        </answer>
+    </qandaentry> -->
+
+    <qandaentry>
+        <question>
+            <para>
+                I see lots of 404 responses for files when the OpenEmbedded
+                build system is trying to download sources.
+                Is something wrong?
+            </para>
+        </question>
+        <answer>
+            <para>
+                Nothing is wrong.
+                The OpenEmbedded build system checks any configured source mirrors before downloading
+                from the upstream sources.
+                The build system does this searching for both source archives and
+                pre-checked out versions of SCM-managed software.
+                These checks help in large installations because it can reduce load on the SCM servers
+                themselves.
+                The address above is one of the default mirrors configured into the
+                build system.
+                Consequently, if an upstream source disappears, the team
+                can place sources there so builds continue to work.
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para>
+                I have machine-specific data in a package for one machine only but the package is
+                being marked as machine-specific in all cases, how do I prevent this?
+            </para>
+        </question>
+        <answer>
+            <para>
+                Set <filename><link linkend='var-SRC_URI_OVERRIDES_PACKAGE_ARCH'>SRC_URI_OVERRIDES_PACKAGE_ARCH</link>
+                </filename> = "0" in the <filename>.bb</filename> file but make sure the package is
+                manually marked as
+                machine-specific for the case that needs it.
+                The code that handles
+                <filename>SRC_URI_OVERRIDES_PACKAGE_ARCH</filename> is in
+                the <filename>meta/classes/base.bbclass</filename> file.
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para id='i-am-behind-a-firewall-and-need-to-use-a-proxy-server'>
+                I'm behind a firewall and need to use a proxy server. How do I do that?
+            </para>
+        </question>
+        <answer>
+            <para>
+                Most source fetching by the OpenEmbedded build system is done
+                by <filename>wget</filename> and you therefore need to specify
+                the proxy settings in a <filename>.wgetrc</filename> file,
+                which can be in your home directory if you are a single user
+                or can be in <filename>/usr/local/etc/wgetrc</filename> as
+                a global user file.
+            </para>
+
+            <para>
+                Following is the applicable code for setting various proxy
+                types in the <filename>.wgetrc</filename> file.
+                By default, these settings are disabled with comments.
+                To use them, remove the comments:
+                <literallayout class='monospaced'>
+     # You can set the default proxies for Wget to use for http, https, and ftp.
+     # They will override the value in the environment.
+     #https_proxy = http://proxy.yoyodyne.com:18023/
+     #http_proxy = http://proxy.yoyodyne.com:18023/
+     #ftp_proxy = http://proxy.yoyodyne.com:18023/
+
+     # If you do not want to use proxy at all, set this to off.
+     #use_proxy = on
+                </literallayout>
+                The Yocto Project also includes a
+                <filename>meta-poky/conf/site.conf.sample</filename> file that
+                shows how to configure CVS and Git proxy servers if needed.
+                For more information on setting up various proxy types and
+                configuring proxy servers, see the
+                "<ulink url='&YOCTO_WIKI_URL;/wiki/Working_Behind_a_Network_Proxy'>Working Behind a Network Proxy</ulink>"
+                Wiki page.
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para>
+                What's the difference between <replaceable>target</replaceable> and <replaceable>target</replaceable><filename>-native</filename>?
+            </para>
+        </question>
+        <answer>
+            <para>
+                The <filename>*-native</filename> targets are designed to run on the system
+                being used for the build.
+                These are usually tools that are needed to assist the build in some way such as
+                <filename>quilt-native</filename>, which is used to apply patches.
+                The non-native version is the one that runs on the target device.
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para>
+                I'm seeing random build failures. Help?!
+            </para>
+        </question>
+        <answer>
+            <para>
+                If the same build is failing in totally different and random
+                ways, the most likely explanation is:
+                <itemizedlist>
+                    <listitem><para>The hardware you are running the build on
+                        has some problem.</para></listitem>
+                    <listitem><para>You are running the build under
+                        virtualization, in which case the virtualization
+                        probably has bugs.</para></listitem>
+                </itemizedlist>
+                The OpenEmbedded build system processes a massive amount of
+                data that causes lots of network, disk and CPU activity and
+                is sensitive to even single-bit failures in any of these areas.
+                True random failures have always been traced back to hardware
+                or virtualization issues.
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para>
+                When I try to build a native recipe, the build fails with <filename>iconv.h</filename> problems.
+            </para>
+        </question>
+        <answer>
+            <para>
+                If you get an error message that indicates GNU
+                <filename>libiconv</filename> is not in use but
+                <filename>iconv.h</filename> has been included from
+                <filename>libiconv</filename>, you need to check to see if
+                you have a previously installed version of the header file
+                in <filename>/usr/local/include</filename>.
+                <literallayout class='monospaced'>
+     #error GNU libiconv not in use but included iconv.h is from libiconv
+                </literallayout>
+                If you find a previously installed file, you should either
+                uninstall it or temporarily rename it and try the build again.
+            </para>
+
+            <para>
+                This issue is just a single manifestation of "system
+                leakage" issues caused when the OpenEmbedded build system
+                finds and uses previously installed files during a native
+                build.
+                This type of issue might not be limited to
+                <filename>iconv.h</filename>.
+                Be sure that leakage cannot occur from
+                <filename>/usr/local/include</filename> and
+                <filename>/opt</filename> locations.
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para>
+                What do we need to ship for license compliance?
+            </para>
+        </question>
+        <answer>
+            <para>
+                This is a difficult question and you need to consult your lawyer
+                for the answer for your specific case.
+                It is worth bearing in mind that for GPL compliance, there needs
+                to be enough information shipped to allow someone else to
+                rebuild and produce the same end result you are shipping.
+                This means sharing the source code, any patches applied to it,
+                and also any configuration information about how that package
+                was configured and built.
+            </para>
+
+            <para>
+                You can find more information on licensing in the
+                "<ulink url='&YOCTO_DOCS_OM_URL;#licensing'>Licensing</ulink>"
+                section in the Yocto Project Overview and Concepts Manual
+                and also in the
+                "<ulink url='&YOCTO_DOCS_DEV_URL;#maintaining-open-source-license-compliance-during-your-products-lifecycle'>Maintaining Open Source License Compliance During Your Product's Lifecycle</ulink>"
+                section in the Yocto Project Development Tasks Manual.
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para>
+                How do I disable the cursor on my touchscreen device?
+            </para>
+        </question>
+        <answer>
+            <para>
+                You need to create a form factor file as described in the
+                "<ulink url='&YOCTO_DOCS_BSP_URL;#bsp-filelayout-misc-recipes'>Miscellaneous BSP-Specific Recipe Files</ulink>"
+                section in the Yocto Project Board Support Packages (BSP)
+                Developer's Guide.
+                Set the <filename>HAVE_TOUCHSCREEN</filename> variable equal to
+                one as follows:
+                <literallayout class='monospaced'>
+     HAVE_TOUCHSCREEN=1
+                </literallayout>
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para>
+                How do I make sure connected network interfaces are brought up by default?
+            </para>
+        </question>
+        <answer>
+            <para>
+                The default interfaces file provided by the netbase recipe does not
+                automatically bring up network interfaces.
+                Therefore, you will need to add a BSP-specific netbase that includes an interfaces
+                file.
+                See the "<ulink url='&YOCTO_DOCS_BSP_URL;#bsp-filelayout-misc-recipes'>Miscellaneous BSP-Specific Recipe Files</ulink>"
+                section in the Yocto Project Board Support Packages (BSP)
+                Developer's Guide for information on creating these types of
+                miscellaneous recipe files.
+            </para>
+            <para>
+                For example, add the following files to your layer:
+                <literallayout class='monospaced'>
+     meta-MACHINE/recipes-bsp/netbase/netbase/MACHINE/interfaces
+     meta-MACHINE/recipes-bsp/netbase/netbase_5.0.bbappend
+                </literallayout>
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para>
+                How do I create images with more free space?
+            </para>
+        </question>
+        <answer>
+            <para>
+                By default, the OpenEmbedded build system creates images
+                that are 1.3 times the size of the populated root filesystem.
+                To affect the image size, you need to set various
+                configurations:
+                <itemizedlist>
+                    <listitem><para><emphasis>Image Size:</emphasis>
+                        The OpenEmbedded build system uses the
+                        <link linkend='var-IMAGE_ROOTFS_SIZE'><filename>IMAGE_ROOTFS_SIZE</filename></link>
+                        variable to define the size of the image in Kbytes.
+                        The build system determines the size by taking into
+                        account the initial root filesystem size before any
+                        modifications such as requested size for the image and
+                        any requested additional free disk space to be
+                        added to the image.</para></listitem>
+                    <listitem><para><emphasis>Overhead:</emphasis>
+                        Use the
+                        <link linkend='var-IMAGE_OVERHEAD_FACTOR'><filename>IMAGE_OVERHEAD_FACTOR</filename></link>
+                        variable to define the multiplier that the build system
+                        applies to the initial image size, which is 1.3 by
+                        default.</para></listitem>
+                    <listitem><para><emphasis>Additional Free Space:</emphasis>
+                        Use the
+                        <link linkend='var-IMAGE_ROOTFS_EXTRA_SPACE'><filename>IMAGE_ROOTFS_EXTRA_SPACE</filename></link>
+                        variable to add additional free space to the image.
+                        The build system adds this space to the image after
+                        it determines its
+                        <filename>IMAGE_ROOTFS_SIZE</filename>.
+                        </para></listitem>
+                </itemizedlist>
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para>
+                Why don't you support directories with spaces in the pathnames?
+            </para>
+        </question>
+        <answer>
+            <para>
+                The Yocto Project team has tried to do this before but too
+                many of the tools the OpenEmbedded build system depends on,
+                such as <filename>autoconf</filename>, break when they find
+                spaces in pathnames.
+                Until that situation changes, the team will not support spaces
+                in pathnames.
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para>
+                How do I use an external toolchain?
+            </para>
+        </question>
+        <answer>
+            <para>
+                The toolchain configuration is very flexible and customizable.
+                It is primarily controlled with the
+                <filename><link linkend='var-TCMODE'>TCMODE</link></filename>
+                variable.
+                This variable controls which <filename>tcmode-*.inc</filename>
+                file to include from the
+                <filename>meta/conf/distro/include</filename> directory within
+                the
+                <link linkend='source-directory'>Source Directory</link>.
+            </para>
+
+            <para>
+                The default value of <filename>TCMODE</filename> is "default",
+                which tells the OpenEmbedded build system to use its internally
+                built toolchain (i.e. <filename>tcmode-default.inc</filename>).
+                However, other patterns are accepted.
+                In particular, "external-*" refers to external toolchains.
+                One example is the Sourcery G++ Toolchain.
+                The support for this toolchain resides in the separate
+                <filename>meta-sourcery</filename> layer at
+                <ulink url='http://github.com/MentorEmbedded/meta-sourcery/'></ulink>.
+            </para>
+
+            <para>
+                In addition to the toolchain configuration, you also need a
+                corresponding toolchain recipe file.
+                This recipe file needs to package up any pre-built objects in
+                the toolchain such as <filename>libgcc</filename>,
+                <filename>libstdcc++</filename>, any locales, and
+                <filename>libc</filename>.
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para id='how-does-the-yocto-project-obtain-source-code-and-will-it-work-behind-my-firewall-or-proxy-server'>
+                How does the OpenEmbedded build system obtain source code and
+                will it work behind my firewall or proxy server?
+            </para>
+        </question>
+        <answer>
+            <para>
+                The way the build system obtains source code is highly
+                configurable.
+                You can setup the build system to get source code in most
+                environments if HTTP transport is available.
+            </para>
+            <para>
+                When the build system searches for source code, it first
+                tries the local download directory.
+                If that location fails, Poky tries
+                <link linkend='var-PREMIRRORS'><filename>PREMIRRORS</filename></link>,
+                the upstream source, and then
+                <link linkend='var-MIRRORS'><filename>MIRRORS</filename></link>
+                in that order.
+            </para>
+            <para>
+                Assuming your distribution is "poky", the OpenEmbedded build
+                system uses the Yocto Project source
+                <filename>PREMIRRORS</filename> by default for SCM-based
+                sources, upstreams for normal tarballs, and then falls back
+                to a number of other mirrors including the Yocto Project
+                source mirror if those fail.
+            </para>
+            <para>
+                As an example, you could add a specific server for the
+                build system to attempt before any others by adding something
+                like the following to the <filename>local.conf</filename>
+                configuration file:
+                <literallayout class='monospaced'>
+     PREMIRRORS_prepend = "\
+     git://.*/.* http://www.yoctoproject.org/sources/ \n \
+     ftp://.*/.* http://www.yoctoproject.org/sources/ \n \
+     http://.*/.* http://www.yoctoproject.org/sources/ \n \
+     https://.*/.* http://www.yoctoproject.org/sources/ \n"
+                </literallayout>
+            </para>
+            <para>
+                These changes cause the build system to intercept Git, FTP,
+                HTTP, and HTTPS requests and direct them to the
+                <filename>http://</filename> sources mirror.
+                You can use <filename>file://</filename> URLs to point to
+                local directories or network shares as well.
+            </para>
+            <para>
+                Aside from the previous technique, these options also exist:
+                <literallayout class='monospaced'>
+     BB_NO_NETWORK = "1"
+                </literallayout>
+                This statement tells BitBake to issue an error instead of
+                trying to access the Internet.
+                This technique is useful if you want to ensure code builds
+                only from local sources.
+            </para>
+            <para>
+                Here is another technique:
+                <literallayout class='monospaced'>
+     BB_FETCH_PREMIRRORONLY = "1"
+                </literallayout>
+                This statement limits the build system to pulling source
+                from the <filename>PREMIRRORS</filename> only.
+                Again, this technique is useful for reproducing builds.
+            </para>
+            <para>
+                Here is another technique:
+                <literallayout class='monospaced'>
+     BB_GENERATE_MIRROR_TARBALLS = "1"
+                </literallayout>
+                This statement tells the build system to generate mirror
+                tarballs.
+                This technique is useful if you want to create a mirror server.
+                If not, however, the technique can simply waste time during
+                the build.
+            </para>
+            <para>
+                Finally, consider an example where you are behind an
+                HTTP-only firewall.
+                You could make the following changes to the
+                <filename>local.conf</filename> configuration file as long as
+                the <filename>PREMIRRORS</filename> server is current:
+                <literallayout class='monospaced'>
+     PREMIRRORS_prepend = "\
+     ftp://.*/.* http://www.yoctoproject.org/sources/ \n \
+     http://.*/.* http://www.yoctoproject.org/sources/ \n \
+     https://.*/.* http://www.yoctoproject.org/sources/ \n"
+     BB_FETCH_PREMIRRORONLY = "1"
+                </literallayout>
+                These changes would cause the build system to successfully
+                fetch source over HTTP and any network accesses to anything
+                other than the <filename>PREMIRRORS</filename> would fail.
+            </para>
+            <para>
+                The build system also honors the standard shell environment
+                variables <filename>http_proxy</filename>,
+                <filename>ftp_proxy</filename>,
+                <filename>https_proxy</filename>, and
+                <filename>all_proxy</filename> to redirect requests through
+                proxy servers.
+            </para>
+            <note>
+                 You can find more information on the
+                 "<ulink url='&YOCTO_WIKI_URL;/wiki/Working_Behind_a_Network_Proxy'>Working Behind a Network Proxy</ulink>"
+                 Wiki page.
+            </note>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para>
+                Can I get rid of build output so I can start over?
+            </para>
+        </question>
+        <answer>
+            <para>
+                Yes - you can easily do this.
+                When you use BitBake to build an image, all the build output
+                goes into the directory created when you run the
+                build environment setup script (i.e.
+                <link linkend='structure-core-script'><filename>&OE_INIT_FILE;</filename></link>).
+                By default, this
+                <link linkend='build-directory'>Build Directory</link>
+                is named <filename>build</filename> but can be named
+                anything you want.
+            </para>
+
+            <para>
+                Within the Build Directory, is the <filename>tmp</filename>
+                directory.
+                To remove all the build output yet preserve any source code or
+                downloaded files from previous builds, simply remove the
+                <filename>tmp</filename> directory.
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para>
+                Why do <filename>${bindir}</filename> and <filename>${libdir}</filename> have strange values for <filename>-native</filename> recipes?
+            </para>
+        </question>
+        <answer>
+            <para>
+                Executables and libraries might need to be used from a
+                directory other than the directory into which they were
+                initially installed.
+                Complicating this situation is the fact that sometimes these
+                executables and libraries are compiled with the expectation
+                of being run from that initial installation target directory.
+                If this is the case, moving them causes problems.
+            </para>
+
+            <para>
+                This scenario is a fundamental problem for package maintainers
+                of mainstream Linux distributions as well as for the
+                OpenEmbedded build system.
+                As such, a well-established solution exists.
+                Makefiles, Autotools configuration scripts, and other build
+                systems are expected to respect environment variables such as
+                <filename>bindir</filename>, <filename>libdir</filename>,
+                and <filename>sysconfdir</filename> that indicate where
+                executables, libraries, and data reside when a program is
+                actually run.
+                They are also expected to respect a
+                <filename>DESTDIR</filename> environment variable, which is
+                prepended to all the other variables when the build system
+                actually installs the files.
+                It is understood that the program does not actually run from
+                within <filename>DESTDIR</filename>.
+            </para>
+
+            <para>
+                When the OpenEmbedded build system uses a recipe to build a
+                target-architecture program (i.e. one that is intended for
+                inclusion on the image being built), that program eventually
+                runs from the root file system of that image.
+                Thus, the build system provides a value of "/usr/bin" for
+                <filename>bindir</filename>, a value of "/usr/lib" for
+                <filename>libdir</filename>, and so forth.
+            </para>
+
+            <para>
+                Meanwhile, <filename>DESTDIR</filename> is a path within the
+                <link linkend='build-directory'>Build Directory</link>.
+                However, when the recipe builds a native program (i.e. one
+                that is intended to run on the build machine), that program
+                is never installed directly to the build machine's root
+                file system.
+                Consequently, the build system uses paths within the Build
+                Directory for <filename>DESTDIR</filename>,
+                <filename>bindir</filename> and related variables.
+                To better understand this, consider the following two paths
+                where the first is relatively normal and the second is not:
+                <note>
+                    Due to these lengthy examples, the paths are artificially
+                    broken across lines for readability.
+                </note>
+                <literallayout class='monospaced'>
+     /home/maxtothemax/poky-bootchart2/build/tmp/work/i586-poky-linux/zlib/
+        1.2.8-r0/sysroot-destdir/usr/bin
+
+     /home/maxtothemax/poky-bootchart2/build/tmp/work/x86_64-linux/
+        zlib-native/1.2.8-r0/sysroot-destdir/home/maxtothemax/poky-bootchart2/
+        build/tmp/sysroots/x86_64-linux/usr/bin
+                </literallayout>
+                Even if the paths look unusual, they both are correct -
+                the first for a target and the second for a native recipe.
+                These paths are a consequence of the
+                <filename>DESTDIR</filename> mechanism and while they
+                appear strange, they are correct and in practice very effective.
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para>
+                The files provided by my <filename>*-native</filename> recipe do
+                not appear to be available to other recipes.
+                Files are missing from the native sysroot, my recipe is
+                installing to the wrong place, or I am getting permissions
+                errors during the do_install task in my recipe! What is wrong?
+            </para>
+        </question>
+        <answer>
+            <para>
+                This situation results when a build system does
+                not recognize the environment variables supplied to it by
+                <link linkend='bitbake-term'>BitBake</link>.
+                The incident that prompted this FAQ entry involved a Makefile
+                that used an environment variable named
+                <filename>BINDIR</filename> instead of the more standard
+                variable <filename>bindir</filename>.
+                The makefile's hardcoded default value of "/usr/bin" worked
+                most of the time, but not for the recipe's
+                <filename>-native</filename> variant.
+                For another example, permissions errors might be caused
+                by a Makefile that ignores <filename>DESTDIR</filename> or uses
+                a different name for that environment variable.
+                Check the the build system to see if these kinds of
+                issues exist.
+            </para>
+        </answer>
+    </qandaentry>
+
+</qandaset>
+</chapter>
+<!--
+vim: expandtab tw=80 ts=4
+-->