Old Oracle (non-ansi) join syntax for more complex join conditions (Oracle 12c)

I am creating a WITH ROWID, on-commit fast refresh materialized view and as I understand it, Oracle requires the query that defines the mview to use non-ansi (old oracle) style joins. I have a join that I dont know how to convert to old oracle join, and that the inbuilt Oracle conversion tool doesn't handle correctly.

Consider EMP as

and OVERHEAD as

I am trying to denormalize for olap, so I want to do something like this

In ANSI I know how to do this, and get the result I want:

select 
   EMP.EmpID, 
   EMP.Department, 
   OVERHEAD.Overhead as CorpOverhead
from EMP
left join OVERHEAD on 
   OVERHEAD.EmpID = EMP.EmpID 
   and EMP.Department = 'Corporate'

In old Oracle, I am stumped. The sqldeveloper tool to toggle between join methods gives me this

select 
   EMP.EmpID, 
   EMP.Department, 
   OVERHEAD.Overhead as CorpOverhead
from EMP,
   OVERHEAD 
where 
   OVERHEAD.EmpID(+) = EMP.EmpID 
   and EMP.Department = 'Corporate'

which results in

which is not what I want.

How can I write an old oracle join to accomplish the same as the ANSI join?

You can use a CASE expression in the JOIN:

select e.EmpID, 
       e.Department, 
       o.Overhead as CorpOverhead
from   EMP e,
       OVERHEAD o
where  CASE e.department WHEN 'Corporate' THEN e.EmpID END = o.EmpID (+)

Which, for your the sample data, outputs:

fiddle