[gnome-settings-daemon] colord: make it optional

[Benjamin Berg <bberg src gnome org>]

commit 4cd4c3f9f6c8e033e61d647bfb0bd4098a452708
Author: Samuel Thibault <samuel thibault ens-lyon org>
Date:   Fri Aug 7 15:19:52 2020 +0200

    colord: make it optional
    
    colord has become completely dependent on udev, not available on
    non-Linux, so make the color plugin optional to fix build there.

 meson.build         | 7 ++++++-
 meson_options.txt   | 1 +
 plugins/meson.build | 4 ++++
 3 files changed, 11 insertions(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index b794652c..0b314c57 100644
--- a/meson.build
+++ b/meson.build
@@ -90,7 +90,6 @@ endif
 add_project_arguments(common_flags + compiler_flags, language: 'c')
 
 glib_dep = dependency('glib-2.0', version: '>=' + glib_min_version)
-colord_dep = dependency('colord', version: '>= 1.3.5')
 geocode_glib_dep = dependency('geocode-glib-1.0', version: '>= 3.10.0')
 gio_dep = dependency('gio-2.0', version: '>= 2.53.0')
 gio_unix_dep = dependency('gio-unix-2.0')
@@ -225,6 +224,12 @@ if enable_network_manager
 endif
 config_h.set10('HAVE_NETWORK_MANAGER', enable_network_manager)
 
+# colord
+enable_colord = get_option('colord')
+if enable_colord
+  colord_dep = dependency('colord', version: '>= 1.3.5')
+endif
+
 gnome = import('gnome')
 i18n = import('i18n')
 pkg = import('pkgconfig')
diff --git a/meson_options.txt b/meson_options.txt
index 15dd8251..3e04cf64 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -11,3 +11,4 @@ option('smartcard', type: 'boolean', value: true, description: 'build with smart
 option('usb-protection', type: 'boolean', value: true, description: 'build with usb-protection support')
 option('wayland', type: 'boolean', value: true, description: 'build with Wayland support')
 option('wwan', type: 'boolean', value: true, description: 'build with WWAN support')
+option('colord', type: 'boolean', value: true, description: 'build with colord support')
diff --git a/plugins/meson.build b/plugins/meson.build
index e8f2c4cd..c8c10db4 100644
--- a/plugins/meson.build
+++ b/plugins/meson.build
@@ -44,6 +44,10 @@ if not enable_wwan
     disabled_plugins += ['wwan']
 endif
 
+if not enable_colord
+  disabled_plugins += ['color']
+endif
+
 # Specify futher required units, 'before' or 'after' may be specified if ordering is needed
 plugin_gate_units = {
     'xsettings': [