+
+/* ========================================================================= */
+/* define additional target keywords */
+/* ========================================================================= */
+
+#if defined(PLATFORM_MSDOS)
+#ifndef TARGET_ALLEGRO
+#define TARGET_ALLEGRO
+#endif
+#ifndef TARGET_X11
+#define TARGET_X11
+#endif
+#endif
+
+#if defined(PLATFORM_UNIX) && defined(TARGET_X11)
+#define TARGET_X11_NATIVE
+#endif
+
+#if defined(TARGET_SDL2)
+#ifndef TARGET_SDL
+#define TARGET_SDL
+#endif
+#endif
+
+
+/* ========================================================================= */
+/* this should better go into "system.h" or "features.h" (yet to be created) */
+/* ========================================================================= */
+
+#if defined(PLATFORM_UNIX) || defined(TARGET_SDL)
+#define NETWORK_AVALIABLE