Created attachment 8540 Remove pkgconfig file As engines are not anymore present in xfce4-session >= 4.13.2, we can also delete pkgconfig file because there are no headers.
Created attachment 8541 Drop pkgconfig file As headers files are not anymore installed, pkgconfig file can be remove too. This patch avoid also to install the shared library libxfsm-4.6.so (it is renamed).
Olivier Duchateau referenced this bugreport in commit a4e499e23ade4f019f56fde944c90f1eb284219b Splash engines are not present anymore in xfce4-session https://git.xfce.org/xfce/xfce4-session/commit?id=a4e499e23ade4f019f56fde944c90f1eb284219b