# ifndef HAVE_DOS_BASED_FILE_SYSTEM
# define HAVE_DOS_BASED_FILE_SYSTEM 1
# endif
+# ifndef HAVE_CASE_INSENSITIVE_FILE_SYSTEM
+# define HAVE_CASE_INSENSITIVE_FILE_SYSTEM 1
+# endif
# define HAS_DRIVE_SPEC(f) HAS_DOS_DRIVE_SPEC (f)
# define IS_DIR_SEPARATOR(c) IS_DOS_DIR_SEPARATOR (c)
# define IS_ABSOLUTE_PATH(f) IS_DOS_ABSOLUTE_PATH (f)
#else /* not DOSish */
+# if defined(__APPLE__)
+# ifndef HAVE_CASE_INSENSITIVE_FILE_SYSTEM
+# define HAVE_CASE_INSENSITIVE_FILE_SYSTEM 1
+# endif
+# endif /* __APPLE__ */
# define HAS_DRIVE_SPEC(f) (0)
# define IS_DIR_SEPARATOR(c) IS_UNIX_DIR_SEPARATOR (c)
# define IS_ABSOLUTE_PATH(f) IS_UNIX_ABSOLUTE_PATH (f)