How to define a variable with {} expansion

[Blake McBride]

Greetings,

Please forgive the basic question.

If I want a variable set to:   abc/def/ghi.a abc/def/klm.a abc/def/opq.a

On other make systems, I would do:  abc/def/{ghi kln opq}.a

How can I do this in GNU Make?

Thank you!

Blake McBride