+/* ========================================================================= */
+/* define additional keywords for MS-DOS platform */
+/* ========================================================================= */
+
+#if defined(PLATFORM_MSDOS)
+
+#ifndef TARGET_ALLEGRO
+#define TARGET_ALLEGRO
+#endif
+
+#ifndef TARGET_X11
+#define TARGET_X11
+#endif
+
+#endif
+
+/* ========================================================================= */
+/* define additional keywords for several Unix platforms */
+/* ========================================================================= */
+
+#if defined(PLATFORM_UNIX) && defined(TARGET_X11)
+#define TARGET_X11_NATIVE
+#endif