Add Lightum package: MacBook light sensor daemon

Also a NixOS service could make sense but the daemon puts
configuration under the Xdg user path.

pkgs/os-specific/linux/lightum/default.nix

@@ -0,0 +1,33 @@
+{ stdenv, fetchgit, libX11, libXScrnSaver, libXext, glib, dbus, pkgconfig, systemd }:
+
+stdenv.mkDerivation {
+  name = "lightum";
+  src = fetchgit {
+    url = https://github.com/poliva/lightum;
+    rev = "123e6babe0669b23d4c1dfa5511088608ff2baa8";
+    sha256 = "1r8c9mb82qgs8i7dczqx8fc7xrbn413b59xkqgjh4z1pfy75sl79";
+  };
+
+  buildInputs = [
+    dbus
+    glib
+    libX11
+    libXScrnSaver
+    libXext
+    pkgconfig
+    systemd
+  ];
+
+  installPhase = ''
+    make install prefix=$out bindir=$out/bin docdir=$out/share/doc \
+      mandir=$out/share/man INSTALL="install -c" INSTALLDATA="install -c -m 644"
+  '';
+
+  meta = {
+    description = "MacBook automatic light sensor daemon";
+    homepage = https://github.com/poliva/lightum;
+    license = stdenv.lib.licenses.gpl2;
+    maintainers = with stdenv.lib.maintainers; [ puffnfresh ];
+    platforms = stdenv.lib.platforms.linux;
+  };
+}

pkgs/top-level/all-packages.nix

@@ -7998,6 +7998,8 @@ let
 
   light = callPackage ../os-specific/linux/light { };
 
+  lightum = callPackage ../os-specific/linux/lightum { };
+
   e3cfsprogs = callPackage ../os-specific/linux/e3cfsprogs { };
 
   ebtables = callPackage ../os-specific/linux/ebtables { };