From 838af929a0ae07e238d30cd7afc96cd7311457ef Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Na=C3=AFm=20Favier?= <n@monade.li>
Date: Mon, 22 May 2023 22:23:38 +0200
Subject: [PATCH] meson: use correct prefix for systemd dirs

See https://www.bassi.io/articles/2018/03/15/pkg-config-and-paths/

Fixes the build in nixpkgs
---
 systemd/system/meson.build | 5 ++++-
 systemd/user/meson.build   | 5 ++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/systemd/system/meson.build b/systemd/system/meson.build
index f90f93d5a..632ff420e 100644
--- a/systemd/system/meson.build
+++ b/systemd/system/meson.build
@@ -2,7 +2,10 @@ systemd_system_unit_dir = get_option('systemd_system_unit_dir')
 if systemd_system_unit_dir == ''
   systemd = dependency('systemd', required: false)
   if systemd.found()
-      systemd_system_unit_dir = systemd.get_variable(pkgconfig: 'systemdsystemunitdir')
+      systemd_system_unit_dir = systemd.get_variable(
+        pkgconfig: 'systemdsystemunitdir',
+        pkgconfig_define: ['prefix', get_option('prefix')],
+      )
   endif
 endif
 if systemd_system_unit_dir == ''
diff --git a/systemd/user/meson.build b/systemd/user/meson.build
index 86a1fd933..7a3522ce5 100644
--- a/systemd/user/meson.build
+++ b/systemd/user/meson.build
@@ -2,7 +2,10 @@ systemd_user_unit_dir = get_option('systemd_user_unit_dir')
 if systemd_user_unit_dir == ''
   systemd = dependency('systemd', required: false)
   if systemd.found()
-    systemd_user_unit_dir = systemd.get_variable(pkgconfig: 'systemduserunitdir')
+    systemd_user_unit_dir = systemd.get_variable(
+      pkgconfig: 'systemduserunitdir',
+      pkgconfig_define: ['prefix', get_option('prefix')],
+    )
   endif
 endif
 if systemd_user_unit_dir == ''