[BusyBox] pivot_root: Function not implemented

[Niall Young]

I'm calling `pivot_root . initrd` and getting
pivot_root: pivot_root: Function not implemented

All other busybox commands seem to be working fine.

Tried busybox-0.60.1 and 0.60.5 under Debian woody with:
libc6 and libc6-dev 2.2.5-11.2 and a custom kernel-image-2.4.19
and kernel-headers-2.4.19

Config.h is below - this has been generated and compiled from within
`mkinitrd-cd` and manually, I can't see any compilation errors but maybe
I'm missing something obvious?  It's being used in an initrd with a
custom 2.2.22 kernel.

Niall Young                                    Chime Communications Pty Ltd
niall at chime.net.au                            Level 6, 263 Adelaide Terrace
Ph: (+61) 08 9213 1330 / 0408 192 797         Perth, Western Australia 6000

     "there's a lot of movement in my trousers at the moment"
                                     -- Dennis Kristofich, Sep 2002

#define BB_CAT
#define BB_CHMOD
#define BB_CHGRP
#define BB_CUT
#define BB_DF
#define BB_DIRNAME
#define BB_DMESG
#define BB_EXPR
#define BB_FIND
#define BB_GREP
#define BB_GUNZIP
#define BB_KILL
#define BB_LN
#define BB_LS
#define BB_MKNOD
#define BB_MOUNT
#define BB_MV
#define BB_PS
#define BB_PWD
#define BB_RM
#define BB_RMDIR
#define BB_TR
#define BB_UMOUNT
#define BB_CHROOT
#define BB_INSMOD
#define BB_SYSLOGD
#define BB_KLOGD
#define BB_PIVOT_ROOT
#define BB_FEATURE_USE_PROCFS
#define BB_FEATURE_TRIVIAL_HELP
#define BB_FEATURE_KLOGD
#define BB_FEATURE_INSMOD_NEW_KERNEL
#define BB_FEATURE_INSMOD_VERSION_CHECKING
#define BB_FEATURE_LS_FOLLOWLINKS
#define BB_FEATURE_EXTRA_QUIET
#define BB_FEATURE_NEW_MODULE_INTERFACE
#define BB_FEATURE_INSMOD_VERSION_CHECKING
#define BB_FEATURE_DEVFS