+but to release a new version, the maintainer needs to ensure that the
+new upstream version really fixes each problem that was fixed in the
+non-maintainer release.
+ <p>
+In addition, the normal maintainer should <em>always</em> retain the
+entry in the changelog file documenting the non-maintainer upload.
+
+
+ <sect1 id="nmu-build">Building source NMUs
+ <p>
+Source NMU packages are built normally. Pick a distribution using the
+same rules as found in <ref id="upload-dist">. Just as described in
+<ref id="uploading">, a normal changes file, etc., will be built. In
+fact, all the prescriptions from <ref id="upload"> apply, including
+the need to announce the NMU to the proper lists.
+ <p>
+Make sure you do <em>not</em> change the value of the maintainer in
+the <file>debian/control</file> file. Your name as given in the NMU entry of
+the <file>debian/changelog</file> file will be used for signing the
+changes file.
+
+
+
+
+ <chapt id="porting">Porting and Being Ported
+ <p>
+Debian supports an ever-increasing number of architectures. Even if
+you are not a porter, and you don't use any architecture but one, it
+is part of your duty as a maintainer to be aware of issues of
+portability. Therefore, even if you are not a porter, you should read
+most of this chapter.
+ <p>
+Porting is the act of building Debian packages for architectures that
+is different from the original architecture of the package
+maintainer's binary package. It is a unique and essential activity.
+In fact, porters do most of the actual compiling of Debian packages.
+For instance, for a single <em>i386</em> binary package, there must be a
+recompile for each architecture, which is amounts to five more builds.
+
+
+ <sect id="kind-to-porters">Being Kind to Porters
+ <p>
+Porters have a difficult and unique task, since they are required to
+deal with a large volume of packages. Ideally, every source package
+should build right out of the box. Unfortunately, this is often not
+the case. This section contains a checklist of ``gotchas'' often
+committed by Debian maintainers -- common problems which often stymie
+porters, and make their jobs unnecessarily more difficult.
+ <p>
+The first and most important watchword is to respond quickly to bug or
+issues raised by porters. Please treat porters with courtesy, as if
+they were in fact co-maintainers of your package (which in a way, they
+are).
+ <p>
+By far, most of the problems encountered by porters are caused by
+<em>packaging bugs</em> in the source packages. Here is a checklist
+of things you should check or be aware of.
+
+<enumlist>
+ <item>
+Don't set architecture to a value other than ``all'' or ``any'' unless
+you really mean it. In too many cases, maintainers don't follow the
+instructions in the <url id="&url-debian-policy;;" name="Debian Policy
+Manual">. Setting your architecture to ``i386'' is usually incorrect.
+ <item>
+Make sure your source package is correct. Do <tt>dpkg-source -x
+<var>package</var>.dsc</tt> to make sure your source package unpacks
+properly. Then, in there, try building your package from scratch with
+<tt>dpkg-buildpackage</tt>.
+ <item>
+Make sure you don't ship your source package with the
+<file>debian/files</file> or <file>debian/substvars</file> files.
+They should be removed by the `clean' target of
+<file>debian/rules</file>.
+ <item>
+Make sure you don't rely on locally installed or hacked configurations
+or programs. For instance, you should never be calling programs in
+<file>/usr/local/bin</file> or the like. Try not to rely on programs
+be setup in a special way. Try building your package on another
+machine, even if it's the same architecture.
+ <item>
+Don't depend on the package you're building already being installed (a
+sub-case of the above issue).
+ <item>
+Don't rely on <prgn>egcc</prgn> being available; don't rely on
+<prgn>gcc</prgn> being a certain version.
+ <item>
+Make sure your debian/rules contains separate ``binary-arch'' and
+``binary-indep'' targets, as the Debian Packaging Manual requires.
+Make sure that both targets work independently, that is, that you can
+call the target without having called the other before. To test this,
+try to run <tt>dpkg-buildpackage -b</tt>.
+ </enumlist>
+
+
+ <sect id="porter-guidelines">Guidelines for Porter Uploads
+ <p>
+If the package builds out of the box for the architecture to be ported
+to, you are in luck and your job is easy. This section applies to
+that case; it describes how to build and upload your binary NMU so
+that it is properly installed into the archive. If you do have to
+patch the package in order to get it to compile for the other
+architecture, you are actually doing a source NMU, so consult <ref
+id="nmu-guidelines"> instead.
+ <p>
+In a binary NMU, no real changes are being made to the source. You do
+not need to touch any of the files in the source package. This
+includes <file>debian/changelog</file>.
+ <p>
+Sometimes you need to recompile a package against other packages
+which have been updated, such as libraries. You do have to bump the
+version number in this case, so that the upgrade system can function
+properly. Even so, these are considered binary-only NMUs -- there is
+no need in this case for all architectures to recompile. You should
+set the version number as in the case of NMU versioning, but add a
+``.0.'' before the the NMU version. For instance, a recompile-only
+NMU of the source package ``foo_1.3-1'' would be numbered
+``foo_1.3-1.0.1''.
+ <p>
+The way to invoke <prgn>dpkg-buildpackage</prgn> is as
+<tt>dpkg-buildpackage -B -m<var>porter-email</var></tt>. Of course,
+set <var>porter-email</var> to your email address. This will do a
+binary-only build of only the architecture-dependant portions of the
+package, using the `binary-arch' target in <file>debian/rules</file>.
+
+
+ <sect1 id="source-nmu-when-porter">
+ <heading>When to do a source NMU if you are a porter</heading>
+ <p>
+Porters doing a source NMU generally follow the guidelines found in
+<ref id="nmu">, just like non-porters. However, it is expected that
+the wait cycle for a porter's source NMU is smaller than for a
+non-porter, since porters have to cope with a large quantity of
+packages.
+ <p>
+Again, the situation varies depending on the distribution they are
+uploading to. Crucial fixes (i.e., changes need to get a source
+package to compile for a released-targeted architecture) can be
+uploaded with <em>no</em> waiting period for the `frozen' distribution.
+ <p>
+However, if you are a porter doing an NMU for `unstable', the above
+guidelines for porting should be followed, with two variations.
+Firstly, the acceptable waiting period -- the time between when the
+bug is submitted to the BTS and when it is OK to do an NMU -- is seven
+days for porters working on the unstable distribution. This period
+can be shortened if the problem is critical and imposes hardship on
+the porting effort, at the discretion of the porter group. (Remember,
+none of this is Policy, just mutually agreed upon guidelines.)
+ <p>
+Secondly, porters doing source NMUs should make sure that the bug they
+submit to the BTS should be of severity `serious' or greater. This
+ensures that a single source package can be used to compile every
+supported Debian architecture by release time. It is very important
+that we have one version of the binary and source package for all
+architecture in order to comply with many licenses.
+ <p>
+Porters should try to avoid patches which simply kludge around bugs in
+the current version of the compile environment, kernel, or libc.
+Sometimes such kludges can't be helped. If you have to kludge around
+compilers bugs and the like, make sure you <tt>#ifdef</tt> your work
+properly; also, document your kludge so that people know to remove it
+once the external problems have been fixed.
+ <p>
+Porters may also have an unofficial location where they can put the
+results of their work during the waiting period. This helps others
+running the port have the benefit of the porter's work, even during
+the waiting period. Of course, such locations have no official
+blessing or status, so buyer, beware.
+
+
+ <sect>Tools for Porters