-extern std::ostream c0out;
-extern std::ostream c1out;
-extern std::ostream c2out;
-extern std::ofstream devnull;
-extern unsigned int ScreenWidth;
+APT_PUBLIC extern std::ostream c0out;
+APT_PUBLIC extern std::ostream c1out;
+APT_PUBLIC extern std::ostream c2out;
+APT_PUBLIC extern std::ofstream devnull;
+APT_PUBLIC extern unsigned int ScreenWidth;