From: Andrew Udvare <audvare@gmail.com>
Subject: [PATCH] Take the Wayland protocol definitions from wayland-protocols

The two XML files are read out of
pcsx2/GS/parallel-gs/Granite/third_party/sdl3/wayland-protocols, which is
three submodules deep and has nothing to do with the Qt frontend that needs
them. Building without the paraLLEl-GS submodule therefore fails at the
protocol generation step even though nothing else needs it.

dev-libs/wayland-protocols installs both, so ask pkg-config where they are.
Its layout is unstable/<name>/<name>-unstable-v<n>.xml, so the subdirectory is
derived from the protocol name; the loop still iterates full stems because the
generated header names, which the sources include, are built from them.

diff --git a/pcsx2-qt/CMakeLists.txt b/pcsx2-qt/CMakeLists.txt
index 067eb55..cd7ff13 100644
--- a/pcsx2-qt/CMakeLists.txt
+++ b/pcsx2-qt/CMakeLists.txt
@@ -317,12 +317,14 @@ if(NOT WIN32 AND NOT APPLE)
 	target_link_libraries(pcsx2-qt PRIVATE Qt6::GuiPrivate)
 	find_program(WAYLAND_SCANNER wayland-scanner)
 	if(WAYLAND_API AND WAYLAND_SCANNER)
-		set(WAYLAND_PROTOCOL_DIR "${CMAKE_SOURCE_DIR}/pcsx2/GS/parallel-gs/Granite/third_party/sdl3/wayland-protocols")
+		find_package(PkgConfig REQUIRED)
+		pkg_get_variable(WAYLAND_PROTOCOL_DIR wayland-protocols pkgdatadir)
 		set(WAYLAND_GENERATED_DIR "${CMAKE_CURRENT_BINARY_DIR}/wayland-generated-protocols")
 		file(MAKE_DIRECTORY "${WAYLAND_GENERATED_DIR}")
 
 		foreach(PROTOCOL relative-pointer-unstable-v1 pointer-constraints-unstable-v1)
-			set(PROTOCOL_XML "${WAYLAND_PROTOCOL_DIR}/${PROTOCOL}.xml")
+			string(REGEX REPLACE "-unstable-v[0-9]+$" "" PROTOCOL_SUBDIR "${PROTOCOL}")
+			set(PROTOCOL_XML "${WAYLAND_PROTOCOL_DIR}/unstable/${PROTOCOL_SUBDIR}/${PROTOCOL}.xml")
 			set(PROTOCOL_HEADER "${WAYLAND_GENERATED_DIR}/${PROTOCOL}-client-protocol.h")
 			set(PROTOCOL_SOURCE "${WAYLAND_GENERATED_DIR}/${PROTOCOL}-protocol.c")
 			add_custom_command(