Cross apply in postgres?

Question

I have the following situation

CROSS APPLY (select top 1 seq.id_prod,
                   seq.id_emp,
                   seq.localizacao,
                   seq.localizacao_modulo,
                   seq.localizacao_nivel,
                   seq.localizacao_rua,
                   seq.localizacao_vao,
                   qtde
            from eq_prod_qtde seq                       
            where seq.id_prod = p.id_prod
              and seq.id_emp = pc.id_emp) ES 
CROSS APPLY (select sum(qtde)
                   qtde
            from eq_prod_qtde seq                       
            where seq.id_prod = p.id_prod) ES1  

However I am having difficulty in making this same process for postgres.