Given the age of the MS-DOS and VMS platforms, it's likely that no one is building flex on them any more. Additionally, the preferred approach is to test for particular platform features rather than to test for particular platforms.
#endif
#endif
-#ifdef VMS
-#ifndef __VMS_POSIX
-#define unlink remove
-#define SHORT_FILE_NAMES
-#endif
-#endif
-
-#ifdef MS_DOS
-#define SHORT_FILE_NAMES
-#endif
-
-
/* Maximum line length we'll have to deal with. */
#define MAXLINE 2048