Fix wayland

Fix compile on wayland OS

Author: mosfet80

rviz_ogre_vendor/rviz_ogre_vendor-extras.cmake.in

@@ -125,10 +125,21 @@ foreach(_lib IN LISTS OGRE_LIBRARIES)
     list(APPEND _extra_interface_link_libraries ${OPENGL_LIBRARIES})
     list(APPEND _extra_interface_link_libraries ${CMAKE_DL_LIBS})
     if(UNIX AND NOT APPLE)
-      find_package(X11 REQUIRED)
-      list(APPEND _extra_interface_link_libraries ${X11_LIBRARIES} ${X11_Xt_LIB} ${X11_Xrandr_LIB})
-      find_library(XAW_LIBRARY NAMES Xaw Xaw7 PATHS ${DEP_LIB_SEARCH_DIR} ${X11_LIB_SEARCH_PATH})
-      list(APPEND _extra_interface_link_libraries ${XAW_LIBRARY})
+      find_package(X11 QUIET)
+      if (NOT XAW_LIBRARY OR NOT X11_Xt_FOUND)
+        set(X11_FOUND FALSE)
+      endif ()
+
+      if(X11_Xt_FOUND)
+        list(APPEND _extra_interface_link_libraries ${X11_LIBRARIES} ${X11_Xt_LIB} ${X11_Xrandr_LIB})
+        find_library(XAW_LIBRARY NAMES Xaw Xaw7 PATHS ${DEP_LIB_SEARCH_DIR} ${X11_LIB_SEARCH_PATH})
+        list(APPEND _extra_interface_link_libraries ${XAW_LIBRARY})
+      else()
+        pkg_check_modules(waylands IMPORTED_TARGET wayland-client wayland-egl egl)
+      endif()
+
+
+
     endif()
     if(APPLE)
       list(APPEND _extra_interface_link_libraries "-framework Cocoa")