leftover files?

while changing over to libpthread i looked into /usr/lib
an see that there is still libkse and other old libraries:

/usr/lib:
 > ll | grep -v "Jan 31"
total 38970
-r--r--r--  1 root  wheel   800957 Oct  9 12:38 libasn1.so.6
-r--r--r--  1 root  wheel     6256 May 30  2003 libcipher.a
lrwxr-xr-x  1 root  wheel       14 May 30  2003 libcipher.so -> 
libcipher.so.2
-r--r--r--  1 root  wheel    10596 May 30  2003 libcipher.so.2
-r--r--r--  1 root  wheel     7438 May 30  2003 libcipher_p.a
-r--r--r--  1 root  wheel    18524 Mar 17  2003 libdevstat.so.3
-r--r--r--  1 root  wheel  1145944 Oct  9 12:38 libgssapi.so.6
-r--r--r--  1 root  wheel   432481 Oct  9 12:38 libhdb.so.6
-r--r--r--  1 root  wheel   598703 Oct  9 12:38 libkadm5clnt.so.6
-r--r--r--  1 root  wheel   909242 Oct  9 12:38 libkadm5srv.so.6
-r--r--r--  1 root  wheel  3142239 Oct  9 12:38 libkrb5.so.6
-r--r--r--  1 root  wheel   259348 Jan 26 13:39 libkse.a
lrwxr-xr-x  1 root  wheel       11 Jan 26 13:39 libkse.so -> libkse.so.1
-r--r--r--  1 root  wheel   137928 Jan 26 13:39 libkse.so.1
-r--r--r--  1 root  wheel   267684 Jan 26 13:39 libkse_p.a
-r--r--r--  1 root  wheel   700338 Oct  9 12:38 libroken.so.6
lrwxr-xr-x  1 root  wheel       12 May 30  2003 pam_ftp.so -> pam_ftp.so.2
-r--r--r--  1 root  wheel     5764 May 30  2003 pam_ftp.so.2
lrwxr-xr-x  1 root  wheel       14 Feb  4  2003 pam_wheel.so -> 
pam_wheel.so.2
-r--r--r--  1 root  wheel     5268 Feb  4  2003 pam_wheel.so.2

/usr/sbin:
 > ll | grep -v "Jan 31"
total 8502
-r-xr-xr-x  1 root  wheel     56724 Jul 30  2003 amldb
-r-xr-xr-x  1 root  wheel      5012 Jun 19  2003 dev_mkdb
-r-xr-xr-x  1 root  wheel      6728 Jan 17  2003 elf2aout
-r-xr-xr-x  1 root  wheel      6016 Apr 21  2003 xten

should i leave it as it is oder or can resp. should i remove that libraries
and do a fresh installworld? maybe the same in /usr/sbin,include,bin,...


franz.