After upgrading to kdelibs-3.5.3-0.2.fc5, I got

connect to address 172.25.70.98: Connection refused
Trying krb4 rlogin...
connect to address 172.25.70.98: Connection refused
trying normal rlogin (/usr/bin/rlogin)
Last login: Wed Jun 21 08:37:27 from gnu-13
/etc/profile.d/kde.sh:4: = not found

when I logged nto my machine. I see

[root@gnu-10 hjl]# more /etc/profile.d/kde.sh
# When/if using prelinking, avoids (some) use of kdeinit
if [ -f /etc/sysconfig/prelink ] ; then
   source /etc/sysconfig/prelink
   if [ "$PRELINKING" == yes ] ; then
      [ -z "$KDE_IS_PRELINKED" ] && KDE_IS_PRELINKED=1 && export KDE_IS_PRELINKE
D
   fi
fi

# if not using IP6, speeds DNS operations
# [ -z "$KDE_NO_IPV6" ] && KDE_NO_IPV6=1 && export KDE_NO_IPV6

# Make sure KDEDIR is set
[ -z "$KDEDIR" ] && KDEDIR="/usr"
export KDEDIR

It should be

if [ "$PRELINKING" = yes ] ; then

instead of

if [ "$PRELINKING" == yes ] ; then