From cf5dd2623bb5518257d0edbb50a84093f08086bb Mon Sep 17 00:00:00 2001
From: Michael Weiss <dev.primeos@gmail.com>
Date: Thu, 24 Oct 2019 14:54:40 +0200
Subject: [PATCH] brightnessctl: Add systemd support

This makes it possible to use brightnessctl without udev rules / suid.
---
 pkgs/misc/brightnessctl/default.nix | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/pkgs/misc/brightnessctl/default.nix b/pkgs/misc/brightnessctl/default.nix
index fc4468921290..387216e052f9 100644
--- a/pkgs/misc/brightnessctl/default.nix
+++ b/pkgs/misc/brightnessctl/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, coreutils }:
+{ stdenv, fetchFromGitHub, coreutils, pkg-config, systemd }:
 
 stdenv.mkDerivation rec {
   pname = "brightnessctl";
@@ -11,12 +11,17 @@ stdenv.mkDerivation rec {
     sha256 = "0immxc7almmpg80n3bdn834p3nrrz7bspl2syhb04s3lawa5y2lq";
   };
 
-  makeFlags = [ "PREFIX=" "DESTDIR=$(out)" ];
+  makeFlags = [ "PREFIX=" "DESTDIR=$(out)" "ENABLE_SYSTEMD=1" ];
 
   postPatch = ''
     substituteInPlace 90-brightnessctl.rules --replace /bin/ ${coreutils}/bin/
+    # For backward compatibility with the NixOS module / udev approach:
+    substituteInPlace Makefile --replace "INSTALL_UDEV_RULES=0" "INSTALL_UDEV_RULES=1"
   '';
 
+  nativeBuildInputs = [ pkg-config ];
+  buildInputs = [ systemd ];
+
   meta = with stdenv.lib; {
     homepage = "https://github.com/Hummer12007/brightnessctl";
     description = "This program allows you read and control device brightness";