forward declare SDL_Color in unit.hpp header

src/drawable_unit.cpp

@@ -19,6 +19,7 @@
 #include "game_preferences.hpp"
 #include "halo.hpp"
 #include "map.hpp"
+#include "sdl/utils.hpp"
 #include "team.hpp"
 #include "unit_animation.hpp"
 #include "unit_animation_component.hpp"

src/unit.cpp

@@ -30,13 +30,14 @@
 #include "play_controller.hpp"
 #include "random_new.hpp"
 #include "resources.hpp"
+#include "scripting/lua.hpp"
+#include "sdl/utils.hpp"
+#include "side_filter.hpp"
+#include "terrain_filter.hpp"
 #include "unit_id.hpp"
 #include "unit_abilities.hpp"
 #include "unit_animation_component.hpp"
 #include "unit_formula_manager.hpp"
-#include "scripting/lua.hpp"
-#include "side_filter.hpp"
-#include "terrain_filter.hpp"
 
 #include <boost/bind.hpp>
 #include <boost/foreach.hpp>

src/unit.hpp

@@ -20,13 +20,13 @@
 #include <boost/tuple/tuple.hpp>
 #include <boost/scoped_ptr.hpp>
 
-#include "sdl/utils.hpp" //only needed for SDL_Color
 #include "unit_types.hpp"
 #include "unit_map.hpp"
 #include "unit_ptr.hpp"
 
 class display;
 class gamemap;
+struct SDL_Color;
 class team;
 class unit_animation_component;
 class unit_formula_manager;