diff --git a/meson.build b/meson.build
index 038c05f..5b976d5 100644
--- a/meson.build
+++ b/meson.build
@@ -40,9 +40,14 @@ foreach f : check_functions
   endif
 endforeach
 
-cdata.set_quoted('SYSTEM_LIBDIR', '/fixme')
-cdata.set_quoted('SYSTEM_INCLUDEDIR', '/fixme')
-cdata.set_quoted('PKG_DEFAULT_PATH', '/fixme')
+default_path = []
+foreach f : ['libdir', 'datadir']
+  default_path += [join_paths(get_option('prefix'), get_option(f), 'pkgconfig')]
+endforeach
+
+cdata.set_quoted('SYSTEM_LIBDIR', join_paths(get_option('prefix'), get_option('libdir')))
+cdata.set_quoted('SYSTEM_INCLUDEDIR', join_paths(get_option('prefix'), get_option('includedir')))
+cdata.set_quoted('PKG_DEFAULT_PATH', ':'.join(default_path))
 cdata.set_quoted('PACKAGE_NAME', meson.project_name())
 cdata.set_quoted('PACKAGE_VERSION', meson.project_version())
 cdata.set_quoted('PACKAGE_BUGREPORT', 'http://github.com/pkgconf/pkgconf/issues')