How to create a database link in someone else's schema?

Question

I have access to Sys, but I don't have the passwords to all personal accounts. generally if you have a create any privilege you just do
create <object> <schema>.object_name ....
if i try this with a database link, the link gets created in my schema with the first part as part of its name.
so
create database link <user>.<db link> does not put the link in the other schema.
what do I do?

Answer 1

I assume Sybrand's suggestion works, but it is common not to know the schema passwords (who wants to remember them anyway?).
We use the time tested "db_su.sql" script:
-- db_su.sql: connect as another user
set term off
store set sqlplus_env rep
set pages 0 feed off ver off echo off term off
DEF user=&1
spo temp.sql
conn / as sysdba
select 'alter user &user identified by values '''||password||''';'
  from dba_users where username = UPPER('&user')
spo off
alter user &user identified by temp;
connect &user/temp
START temp.sql
@sqlplus_env
set term on:p