make delete-old: missing some files?

hi there,

i've made my -CURRENT world and installed, but "make delete-old" tells
me it cannot remove some directories:

>>> Removing old directories
rmdir: /usr/share/dtrace: Directory not empty
rmdir: /usr/lib/dtrace: Directory not empty
rmdir: /usr/lib/debug/usr/tests/libexec/rtld-elf: Directory not empty
rmdir: /usr/lib/debug/usr/tests/libexec: Directory not empty
rmdir: /usr/lib/debug/usr/tests: Directory not empty
rmdir: /usr/lib/debug/usr/lib/i18n: Directory not empty
rmdir: /usr/lib/debug/usr/lib/engines: Directory not empty
rmdir: /usr/lib/debug/usr/lib: Directory not empty
rmdir: /usr/lib/debug/usr: Directory not empty

taking /usr/lib/debug/usr/lib/engines as an example:

# find /usr/lib/debug/usr/lib/engines
/usr/lib/debug/usr/lib/engines
/usr/lib/debug/usr/lib/engines/lib4758cca.so.debug
/usr/lib/debug/usr/lib/engines/libaep.so.debug
/usr/lib/debug/usr/lib/engines/libatalla.so.debug
/usr/lib/debug/usr/lib/engines/libcapi.so.debug
/usr/lib/debug/usr/lib/engines/libchil.so.debug
/usr/lib/debug/usr/lib/engines/libcswift.so.debug
/usr/lib/debug/usr/lib/engines/libgost.so.debug
/usr/lib/debug/usr/lib/engines/libnuron.so.debug
/usr/lib/debug/usr/lib/engines/libsureware.so.debug
/usr/lib/debug/usr/lib/engines/libubsec.so.debug

am i missing something, or ObsoleteFiles.inc lacks a few entries?

./danfe