initial commit of Enea Linux 3.1HEADmaster

Migrated from the internal git server on the dora-enea branch

Signed-off-by: Adrian Dudau <adrian.dudau@enea.com>

1 files changed, 698 insertions, 0 deletions

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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; ] >
+
+<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 "<ulink url='&YOCTO_DOCS_DEV_URL;#poky'>Poky</ulink>"
+                refers to the specific reference build system that
+                the Yocto Project provides.
+                Poky is based on <ulink url='&YOCTO_DOCS_DEV_URL;#oe-core'>OE-Core</ulink>
+                and <ulink url='&YOCTO_DOCS_DEV_URL;#bitbake-term'>BitBake</ulink>.
+                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>
+                My development system does not have Python 2.7.3 or greater,
+                which the Yocto Project requires.
+                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-and-python-versions'>Required Git, tar, and Python 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
+                        <ulink url='&YOCTO_DOCS_DEV_URL;#oe-core'>OE-Core</ulink> 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 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 add a package, see the section
+                "<ulink url='&YOCTO_DOCS_DEV_URL;#usingpoky-extend-addpkg'>Writing a Recipe to Add a Package to Your Image</ulink>"
+                in the Yocto Project Development 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>
+                What is GNOME Mobile and what is the difference between GNOME Mobile and GNOME?
+            </para>
+        </question>
+        <answer>
+            <para>
+                GNOME Mobile is a subset of the <ulink url='http://www.gnome.org'>GNOME</ulink>
+                platform targeted at mobile and embedded devices.
+                The main difference between GNOME Mobile and standard GNOME is that
+                desktop-orientated libraries have been removed, along with deprecated libraries,
+                creating a much smaller footprint.
+            </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 on
+                <filename>&YOCTO_HOME_URL;/sources/*</filename>. 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>
+                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 in your home directory.
+                Here are some example settings:
+                <literallayout class='monospaced'>
+     http_proxy = http://proxy.yoyodyne.com:18023/
+     ftp_proxy = http://proxy.yoyodyne.com:18023/
+                </literallayout>
+                The Yocto Project also includes a
+                <filename>site.conf.sample</filename> file that shows how to
+                configure CVS and Git proxy servers if needed.
+            </para>
+        </answer>
+    </qandaentry>
+
+    <qandaentry>
+        <question>
+            <para>
+                What’s the difference between <filename>foo</filename> and <filename>foo-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>
+                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_DEV_URL;#licensing'>Licensing</ulink>"
+                and "<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>"
+                sections, both of which are in the Yocto Project Development
+                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
+                <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>.
+            </para>
+
+            <para>
+                The default value of <filename>TCMODE</filename> is "default"
+                (i.e. <filename>tcmode-default.inc</filename>).
+                However, other patterns are accepted.
+                In particular, "external-*" refers to external toolchains of
+                which there are some basic examples included in the
+                OpenEmbedded Core (<filename>meta</filename>).
+                You can use your own custom toolchain definition in your own
+                layer (or as defined in the <filename>local.conf</filename>
+                file) at the location
+                <filename>conf/distro/include/tcmode-*.inc</filename>.
+            </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>.
+                An example is the
+                <filename>external-sourcery-toolchain.bb</filename>, which is
+                located in <filename>meta/recipes-core/meta/</filename> within
+                the Source Directory.
+            </para>
+
+            <para>
+                For information on installing and using cross-development
+                toolchains, see the
+                "<ulink url='&YOCTO_DOCS_ADT_URL;#installing-the-adt'>Installing the ADT and Toolchains</ulink>"
+                section in the Yocto Project Application Developer's Guide.
+                For general information on cross-development toolchains, see
+                the
+                "<link linkend='cross-development-toolchain-generation'>Cross-Development Toolchain Generation</link>"
+                section.
+            </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>
+        </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>
+                or
+                <link linkend='structure-memres-core-script'><filename>oe-init-build-env-memres</filename></link>).
+                By default, this <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>
+                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>
+
+
+</qandaset>
+</chapter>
+<!--
+vim: expandtab tw=80 ts=4
+-->