REVERT:
From c9650c0bb7324c32d82fa6d7d898e236f10ea63b Mon Sep 17 00:00:00 2001
From: Richard Hughes <richard@hughsie.com>
Date: Mon, 24 Jul 2017 14:30:12 +0100
Subject: [PATCH] Make udev a hard requirement

Index: src/plugins/meson.build
--- src/plugins/meson.build.orig
+++ src/plugins/meson.build
@@ -15,6 +15,7 @@ shared_module('colord_sensor_example',
     gio,
   ],
 )
+if get_option('udev_rules')
 shared_module('colord_sensor_camera',
   sources : [
     'cd-plugin-camera.c',
@@ -73,4 +74,5 @@ if get_option('sane')
       gudev,
     ],
   )
+endif
 endif
