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+% Build instructions
+% Guilhem Moulin <guilhem@fripost.org>
+
+On Debian 9 (codename *Stretch*) and later, installing [`interimap`(1)]
+is a single command away:
+
+    $ apt-get install interimap
+
+This document is for those who are running other systems, and/or who
+wish to install from [source](https://git.guilhem.org/interimap).
+
+
+Dependencies
+============
+
+[`interimap`(1)](interimap.1.html) depends on Perl ≥5.20 and the
+following Perl modules:
+
+  * [`Compress::Raw::Zlib`](https://perldoc.perl.org/Compress/Raw/Zlib.html) (*core module*)
+  * [`Config::Tiny`](https://metacpan.org/pod/Config::Tiny)
+  * [`DBI`](https://metacpan.org/pod/DBI)
+  * [`DBD::SQLite`](https://metacpan.org/pod/DBD::SQLite)
+  * [`Errno`](https://perldoc.perl.org/Errno.html) (*core module*)
+  * [`Getopt::Long`](https://perldoc.perl.org/Getopt/Long.html) (*core module*)
+  * [`MIME::Base64`](https://perldoc.perl.org/MIME/Base64.html) (*core module*) — if authentication is required
+  * [`List::Util`](https://perldoc.perl.org/List/Util.html) (*core module*)
+  * [`Net::SSLeay`](https://metacpan.org/pod/Net::SSLeay) ≥1.73
+  * [`POSIX`](https://perldoc.perl.org/POSIX.html) (*core module*)
+  * [`Socket`](https://perldoc.perl.org/Socket.html) (*core module*)
+  * [`Time::HiRes`](https://perldoc.perl.org/Time/HiRes.html) (*core module*) — if `logfile` is set
+
+On Debian GNU/Linux systems, the dependencies can be installed with the
+following command:
+
+    $ apt install libconfig-tiny-perl \
+		libdbi-perl \
+		libdbd-sqlite3-perl \
+		libnet-ssleay-perl
+
+Additional packages are required in order to run the test suite:
+
+    $ apt install dovecot-imapd procps sqlite3 xxd
+<!-- -->
+    $ make test
+
+
+Generate documentation
+======================
+
+Yet another set of packages is needed to generate the documentation:
+
+    $ apt install jq pandoc
+
+Run `` `make manual` `` (or just `` `make` ``) in order to generate the
+manpages.  You'll find them at `doc/*.[1-9]`.  Use for instance `` `man
+-l doc/interimap.1` `` in order to read your copy of the [`interimap`(1)]
+manpage.
+
+The HTML documentation can be built with `` `make html` ``.  HTML files
+are generated alongside their Markdown source by default, but you can
+choose another target directory using the `HTML_ROOTDIR` environment
+variable (the value of which defaults to `./doc`).  Moreover the
+[`libjs-bootstrap`](https://tracker.debian.org/libjs-bootstrap) is
+needed by default for the local CSS file; this can be controlled with
+the `CSS` environment variable (the value of which defaults to
+`/usr/share/javascript/bootstrap/css/bootstrap.min.css`).
+
+For instance, use
+
+    $ CSS="https://guilhem.org/static/css/bootstrap.min.css" \
+		HTML_ROOTDIR="$XDG_RUNTIME_DIR/interimap" \
+		make html
+
+to generate the HTML documentation under directory `$XDG_RUNTIME_DIR/interimap`
+(which needs to exist) using a remote CSS file.
+
+The `doc` target generates all documentation, manpages as well as HTML
+pages.
+
+
+Build custom Debian package
+===========================
+
+Debian GNU/Linux users can also use [`gbp`(1)] from
+[`git-buildpackage`](https://tracker.debian.org/pkg/git-buildpackage) in
+order to build their own package:
+
+    $ git checkout debian
+    $ gbp buildpackage
+
+Alternatively, for the development version:
+
+    $ git checkout debian
+    $ git merge master
+    $ gbp buildpackage --git-force-create --git-upstream-tree=BRANCH
+
+
+[`interimap`(1)]: interimap.1.html
+[`gbp`(1)]: https://manpages.debian.org/git-buildpackage/gbp.1.en.html