make delete-old failed to remove bind directories

as title and as of

FreeBSD jsli-bsd64 10.0-ALPHA4 FreeBSD 10.0-ALPHA4 #3 r255962: Tue Oct
 1 15:22:04 CST 2013     jsli_at_jsli-bsd64:/usr/obj/usr/src/sys/GENERIC
amd64

'make delete-old' failed to remove bind-related dirs. Looks like
ordering issue to me. Also there are still some dirs and files exist
after several repeat runs to overcome ordering issue. Not sure if they
are created by me though. I did not make use of bind.


output:
>>> Removing old directories
/usr/include/lwres
rmdir: /usr/share/doc/bind9: Directory not empty
/usr/share/doc/bind9/arm
/usr/share/doc/bind9/misc
/var/named/dev
rmdir: /var/named/etc: Directory not empty
rmdir: /var/named/etc/namedb: Directory not empty
/var/named/etc/namedb/dynamic
/var/named/etc/namedb/master
/var/named/etc/namedb/slave
rmdir: /var/named/var: Directory not empty
/var/named/var/dump
/var/named/var/log
rmdir: /var/named/var/run: Directory not empty
/var/named/var/run/named
/var/named/var/stats
/var/run/named
>>> Old directories removed
To remove old libraries run 'make delete-old-libs'.
jsli_at_jsli-bsd64:/usr/src # ls -R /var/named/etc/namedb/
named.conf  working/

/var/named/etc/namedb/working:
jsli_at_jsli-bsd64:/usr/src #

Jia-Shiun.