+--- widelands-build21/xdg/CMakeLists.txt.orig 2020-07-12 21:33:44.000000000 +0200
++++ widelands-build21/xdg/CMakeLists.txt 2020-07-29 06:20:12.689266184 +0200
+@@ -6,19 +6,19 @@
+ list(APPEND icon_sizes "16" "32" "48" "64" "128")
+ foreach (icon_size ${icon_sizes})
+ #install(FILES ${CMAKE_SOURCE_DIR}/data/images/logos/wl-ico-${icon_size}.png DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/icons/hicolor/${icon_size}x${icon_size}/apps RENAME ${XDG_APPLICATION_ID}.png)
+- install(FILES ${CMAKE_SOURCE_DIR}/data/images/logos/wl-ico-${icon_size}.png DESTINATION ../share/icons/hicolor/${icon_size}x${icon_size}/apps RENAME ${XDG_APPLICATION_ID}.png)
++ install(FILES ${CMAKE_SOURCE_DIR}/data/images/logos/wl-ico-${icon_size}.png DESTINATION ${CMAKE_INSTALL_DATADIR}/icons/hicolor/${icon_size}x${icon_size}/apps RENAME ${XDG_APPLICATION_ID}.png)
+ endforeach (icon_size ${icon_sizes})
+ #install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/${CMAKE_PROJECT_NAME}.6 DESTINATION ${CMAKE_INSTALL_MANDIR}/man6)
+-install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/${CMAKE_PROJECT_NAME}.6 DESTINATION ../share/man/man6)
++install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/${CMAKE_PROJECT_NAME}.6 DESTINATION ${CMAKE_INSTALL_DATADIR}/man/man6)
+ #install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/${XDG_APPLICATION_ID}.desktop DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/applications)
+-install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/${XDG_APPLICATION_ID}.desktop DESTINATION ../share/applications)
++install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/${XDG_APPLICATION_ID}.desktop DESTINATION ${CMAKE_INSTALL_DATADIR}/applications)
+ #install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/${XDG_APPLICATION_ID}.appdata.xml DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/metainfo)
+-install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/${XDG_APPLICATION_ID}.appdata.xml DESTINATION ../share/metainfo)
++install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/${XDG_APPLICATION_ID}.appdata.xml DESTINATION ${CMAKE_INSTALL_DATADIR}/metainfo)
+
+ find_program(GTK_UPDATE_ICON_CACHE NAMES gtk-update-icon-cache)
+ if (GTK_UPDATE_ICON_CACHE)
+ #install(CODE "execute_process (COMMAND ${GTK_UPDATE_ICON_CACHE} -t -f ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_DATAROOTDIR}/icons/hicolor ||: )")
+- install(CODE "execute_process (COMMAND ${GTK_UPDATE_ICON_CACHE} -t -f ${CMAKE_INSTALL_PREFIX}/../share/icons/hicolor ||: )")
++ install(CODE "execute_process (COMMAND ${GTK_UPDATE_ICON_CACHE} -t -f ${CMAKE_INSTALL_DATADIR}/icons/hicolor ||: )")
+ else (GTK_UPDATE_ICON_CACHE)
+ message(WARNING "gtk-update-icon-cache not found!")
+ endif (GTK_UPDATE_ICON_CACHE)