doc/builders/packages/xorg: Convert to CommonMark.

I had to pick 7.4 or 7.5. I picked 7.4 for now.

3 files changed, 42 insertions, 35 deletions

diff --git a/doc/builders/packages/index.xml b/doc/builders/packages/index.xml
index d967718cab3..3007c297c16 100644
--- a/doc/builders/packages/index.xml
+++ b/doc/builders/packages/index.xml
@@ -21,5 +21,5 @@
  <xi:include href="cataclysm-dda.section.xml" />
  <xi:include href="urxvt.xml" />
  <xi:include href="weechat.section.xml" />
- <xi:include href="xorg.xml" />
+ <xi:include href="xorg.section.xml" />
 </chapter>
diff --git a/doc/builders/packages/xorg.section.md b/doc/builders/packages/xorg.section.md
new file mode 100644
index 00000000000..c8a4c121981
--- /dev/null
+++ b/doc/builders/packages/xorg.section.md
@@ -0,0 +1,41 @@
+# X.org {#sec-xorg}
+
+The Nix expressions for the X.org packages reside in
+`pkgs/servers/x11/xorg/default.nix`. This file is automatically generated from
+lists of tarballs in an X.org release. As such it should not be modified
+directly; rather, you should modify the lists, the generator script or the
+file `pkgs/servers/x11/xorg/overrides.nix`, in which you can override or add
+to the derivations produced by the generator.
+
+The generator is invoked as follows:
+
+```sh
+cd pkgs/servers/x11/xorg
+cat tarballs-7.4.list extra.list old.list | perl ./generate-expr-from-tarballs.pl
+```
+
+For each of the tarballs in the `.list` files, the script downloads it,
+unpacks it, and searches its `configure.ac` and `*.pc.in` files for
+dependencies. This information is used to generate `default.nix`. The
+generator caches downloaded tarballs between runs. Pay close attention to the
+`NOT FOUND: $NAME` messages at the end of the run, since they may indicate
+missing dependencies. (Some might be optional dependencies, however.)
+
+A file like `tarballs-7.4.list` contains all tarballs in a X.org release. It
+can be generated like this:
+
+```sh
+export i="mirror://xorg/X11R7.4/src/everything/"
+cat $(PRINT_PATH=1 nix-prefetch-url $i | tail -n 1) \
+  | perl -e 'while (&lt;>) { if (/(href|HREF)="([^"]*.bz2)"/) { print "$ENV{'i'}$2\n"; }; }' \
+  | sort > tarballs-7.4.list
+```
+
+`extra.list` contains libraries that aren’t part of X.org proper, but are
+closely related to it, such as `libxcb`. `old.list` contains some packages
+that were removed from X.org, but are still needed by some people or by other
+packages (such as `imake`).
+
+If the expression for a package requires derivation attributes that the
+generator cannot figure out automatically (say, `patches` or a `postInstall`
+hook), you should modify `pkgs/servers/x11/xorg/overrides.nix`.
diff --git a/doc/builders/packages/xorg.xml b/doc/builders/packages/xorg.xml
deleted file mode 100644
index ebf4930cc09..00000000000
--- a/doc/builders/packages/xorg.xml
+++ /dev/null
@@ -1,34 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xml:id="sec-xorg">
- <title>X.org</title>
-
- <para>
-  The Nix expressions for the X.org packages reside in <filename>pkgs/servers/x11/xorg/default.nix</filename>. This file is automatically generated from lists of tarballs in an X.org release. As such it should not be modified directly; rather, you should modify the lists, the generator script or the file <filename>pkgs/servers/x11/xorg/overrides.nix</filename>, in which you can override or add to the derivations produced by the generator.
- </para>
-
- <para>
-  The generator is invoked as follows:
-<screen>
-<prompt>$ </prompt>cd pkgs/servers/x11/xorg
-<prompt>$ </prompt>cat tarballs-7.5.list extra.list old.list \
-  | perl ./generate-expr-from-tarballs.pl
-</screen>
-  For each of the tarballs in the <filename>.list</filename> files, the script downloads it, unpacks it, and searches its <filename>configure.ac</filename> and <filename>*.pc.in</filename> files for dependencies. This information is used to generate <filename>default.nix</filename>. The generator caches downloaded tarballs between runs. Pay close attention to the <literal>NOT FOUND: <replaceable>name</replaceable></literal> messages at the end of the run, since they may indicate missing dependencies. (Some might be optional dependencies, however.)
- </para>
-
- <para>
-  A file like <filename>tarballs-7.5.list</filename> contains all tarballs in a X.org release. It can be generated like this:
-<screen>
-<prompt>$ </prompt>export i="mirror://xorg/X11R7.4/src/everything/"
-<prompt>$ </prompt>cat $(PRINT_PATH=1 nix-prefetch-url $i | tail -n 1) \
-  | perl -e 'while (&lt;>) { if (/(href|HREF)="([^"]*.bz2)"/) { print "$ENV{'i'}$2\n"; }; }' \
-  | sort > tarballs-7.4.list
-</screen>
-  <filename>extra.list</filename> contains libraries that aren’t part of X.org proper, but are closely related to it, such as <literal>libxcb</literal>. <filename>old.list</filename> contains some packages that were removed from X.org, but are still needed by some people or by other packages (such as <varname>imake</varname>).
- </para>
-
- <para>
-  If the expression for a package requires derivation attributes that the generator cannot figure out automatically (say, <varname>patches</varname> or a <varname>postInstall</varname> hook), you should modify <filename>pkgs/servers/x11/xorg/overrides.nix</filename>.
- </para>
-</section>