Created attachment 8216 Fix g_type_class_add_private is deprecated Patch fixes warnings (g_type_class_add_private is deprecated) during build stage. src/common/parole-screensaver.[ch] are not modified, because it depends of another patch, in order to add support of org.xfce.ScreenSaver service.
Olivier Duchateau referenced this bugreport in commit 6450315905d686cf0b7ebcf872def608a2b53e09 Fix g_type_class_add_private is deprecated (bug #15014) https://git.xfce.org/apps/parole/commit?id=6450315905d686cf0b7ebcf872def608a2b53e09
Thanks for the patch! Applied above.