https://gitlab.gnome.org/GNOME/phodav/-/merge_requests/19

From 5f6ca03ab91df31ede9a4435c63cf5af0ef50c06 Mon Sep 17 00:00:00 2001
From: Matt Turner <mattst88@gmail.com>
Date: Mon, 3 May 2021 22:47:16 -0400
Subject: [PATCH] meson: Allow specifying systemd/udev directories

Closes: https://gitlab.gnome.org/GNOME/phodav/-/issues/1
---
 data/meson.build  | 24 ++++++++++++++++++------
 meson_options.txt | 12 ++++++------
 2 files changed, 24 insertions(+), 12 deletions(-)

diff --git a/data/meson.build b/data/meson.build
index c466030..26ad939 100644
--- a/data/meson.build
+++ b/data/meson.build
@@ -1,16 +1,28 @@
-systemd = dependency('systemd', required : get_option('systemd'))
-if systemd.found()
+systemd_systemunitdir = get_option('systemdsystemunitdir')
+if systemd_systemunitdir == ''
+  systemd = dependency('systemd', required : false)
+  if systemd.found()
+    systemd_systemunitdir = systemd.get_pkgconfig_variable('systemdsystemunitdir')
+  endif
+endif
+if systemd_systemunitdir != ''
   install_data(
     'spice-webdavd.service',
-    install_dir : systemd.get_pkgconfig_variable('systemdsystemunitdir')
+    install_dir : systemd_systemunitdir
   )
 endif
 
-udev = dependency('udev', required : get_option('udev'))
-if udev.found()
+udev_rulesdir = get_option('udevrulesdir')
+if udev_rulesdir == ''
+  udev = dependency('udev', required : false)
+  if udev.found()
+    udev_rulesdir = '@0@/@1@'.format(udev.get_pkgconfig_variable('udevdir'), 'rules.d')
+  endif
+endif
+if udev_rulesdir != ''
   install_data(
     '70-spice-webdavd.rules',
-    install_dir : '@0@/@1@'.format(udev.get_pkgconfig_variable('udevdir'), 'rules.d'),
+    install_dir : udev_rulesdir
   )
 endif
 
diff --git a/meson_options.txt b/meson_options.txt
index 724a0d3..1b075f5 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -6,13 +6,13 @@ option('avahi',
        type : 'feature',
        description : 'Build with avahi/mdns')
 
-option('systemd',
-       type : 'feature',
-       description : 'Install systemd units/configuration')
+option('systemdsystemunitdir',
+       type: 'string',
+       description: 'Directory for systemd system unit files')
 
-option('udev',
-       type : 'feature',
-       description : 'Install udev rules')
+option('udevrulesdir',
+       type : 'string',
+       description : 'Directory for udev rules')
 
 option('build-id',
        type : 'integer',
-- 
2.26.3