root: fix output directory layout with -Dgnuinstall=ON

Make "$out" more conformant to the bin/ lib/ share/ hirarchy
instead of messing up the user profile
with stuff like cmake/ config/ macros/ icons/ js/ tutorials/ ...

In this layout,
*   `tutorials` is now under `share/doc/ROOT/tutorial`
*   `cmake`, `font`, `icons`, `js` and `macro` is now under `share/root`
*   `Makefile.comp` and `Makefile.config` in now under `etc/root`.

nixos/doc/manual/from_md/release-notes/rl-2305.section.xml

@@ -288,6 +288,22 @@
           dynamically.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          The <literal>root</literal> package is now built with the
+          <literal>&quot;-Dgnuinstall=ON&quot;</literal> CMake flag,
+          making the output conform the <literal>bin</literal>
+          <literal>lib</literal> <literal>share</literal> layout. In
+          this layout, <literal>tutorials</literal> is under
+          <literal>share/doc/ROOT/</literal>; <literal>cmake</literal>,
+          <literal>font</literal>, <literal>icons</literal>,
+          <literal>js</literal> and <literal>macro</literal> under
+          <literal>share/root</literal>;
+          <literal>Makefile.comp</literal> and
+          <literal>Makefile.config</literal> under
+          <literal>etc/root</literal>.
+        </para>
+      </listitem>
       <listitem>
         <para>
           Enabling global redirect in

nixos/doc/manual/release-notes/rl-2305.section.md

@@ -82,6 +82,8 @@ In addition to numerous new and upgraded packages, this release has the followin
 
 - The new option `users.motdFile` allows configuring a Message Of The Day that can be updated dynamically.
 
+- The `root` package is now built with the `"-Dgnuinstall=ON"` CMake flag, making the output conform the `bin` `lib` `share` layout. In this layout, `tutorials` is under `share/doc/ROOT/`; `cmake`, `font`, `icons`, `js` and `macro` under `share/root`; `Makefile.comp` and `Makefile.config` under `etc/root`.
+
 - Enabling global redirect in `services.nginx.virtualHosts` now allows one to add exceptions with the `locations` option.
 
 - Resilio sync secret keys can now be provided using a secrets file at runtime, preventing these secrets from ending up in the Nix store.

pkgs/applications/science/misc/root/default.nix

@@ -171,6 +171,7 @@ stdenv.mkDerivation rec {
     "-Dfftw3=OFF"
     "-Dfitsio=OFF"
     "-Dfortran=OFF"
+    "-Dgnuinstall=ON"
     "-Dimt=ON"
     "-Dgfal=OFF"
     "-Dgviz=OFF"