# define S_IWUSR 0200
# define S_IXUSR 0100
# endif
-# define S_IRGRP (S_IRUSR>>3)
-# define S_IWGRP (S_IWUSR>>3)
-# define S_IXGRP (S_IXUSR>>3)
-# define S_IROTH (S_IRUSR>>6)
-# define S_IWOTH (S_IWUSR>>6)
-# define S_IXOTH (S_IXUSR>>6)
+#endif
+
+#ifndef S_IRGRP
+# ifdef S_IRUSR
+# define S_IRGRP (S_IRUSR>>3)
+# define S_IWGRP (S_IWUSR>>3)
+# define S_IXGRP (S_IXUSR>>3)
+# else
+# define S_IRGRP 0040
+# define S_IWGRP 0020
+# define S_IXGRP 0010
+# endif
+#endif
+
+#ifndef S_IROTH
+# ifdef S_IRUSR
+# define S_IROTH (S_IRUSR>>6)
+# define S_IWOTH (S_IWUSR>>6)
+# define S_IXOTH (S_IXUSR>>6)
+# else
+# define S_IROTH 0040
+# define S_IWOTH 0020
+# define S_IXOTH 0010
+# endif
#endif
#ifndef S_ISUID