Don't use join_path

data/meson.build

@@ -23,5 +23,5 @@ compiled_schemas = gnome.compile_schemas(
 
 install_data(
   'uk.me.bcowan.Rugby.gschema.xml',
-  install_dir: join_paths(datadir, 'glib-2.0', 'schemas'),
+  install_dir: datadir / 'glib-2.0' / 'schemas',
 )

meson.build

@@ -14,6 +14,7 @@ project('rugby', 'c',
 )
 
 datadir = get_option('datadir')
+desktopdir = datadir / 'applications'
 
 gnome = import('gnome')