php4 snmp upgrade problems

to do the security upgrade you have to force php4. I get a libsnmp message: this is all dealt with in http://sdb.suse.de/en/sdb/html/leah_70_php4_apache_error.html but it doesn't solve the problem. rpm -e snmp as is suggested gives a message the package doen't exists installing ucdsnmp by Yast tells me it is installed already so I re-installed it and got the same problem with the php4 upgrade again, so I can't run appache. Who has tackled this problem? piet