diff --git a/src/saveload/CMakeLists.txt b/src/saveload/CMakeLists.txt
--- a/src/saveload/CMakeLists.txt
+++ b/src/saveload/CMakeLists.txt
@@ -13,6 +13,8 @@ add_files(
     depot_sl.cpp
     economy_sl.cpp
     engine_sl.cpp
+    extended_ver_sl.cpp
+    extended_ver_sl.h
     game_sl.cpp
     gamelog_sl.cpp
     goal_sl.cpp
@@ -31,6 +33,7 @@ add_files(
     order_sl.cpp
     saveload.cpp
     saveload.h
+    saveload_buffer.h
     saveload_filter.h
     saveload_internal.h
     settings_sl.cpp