readme

早期freebsd实现

If you plan on using union mounts, then you should consider replacing
"libc/gen/opendir.c" in the C library with the file "libc.opendir.c"
in this directory.  The replacement version of opendir() automatically
removes duplicate names when a union stack is encountered.  You will
then need to rebuild the C library and all commands.

@(#)README	8.1 (Berkeley) 2/15/94