The Uruguay-Argentina project is being directed by Lucia Garibaldi
Director also reveals plans for his second feature.
The festival’s communications head Ruth Pérez de Anucita will join the committee in 2019.
Debut feature receives its world premiere in San Sebastian’s New Directors competition this weekend.
The 2018 event takes place from Friday 21-Sunday 29 September.
Venice, Cannes, Locarno and Sarajevo have already signed document.
The event will take place on September 24 as part of the festival.
The film will have its world premiere this month in Competition at San Sebastian Film Festival.
Filipino filmmaker explores Manila crime underworld in new thriller.
The other finalists were Three Billboards, Cold War and Zama.
The winning director and Spanish distributor in the section will receive €50,000.
Writer-director Hirokazu Kore-eda was previously announced as a 2018 Donostia award recipient.
Nadine Labaki’s ’Capharnaüm’ and Jacques Audiard’s ’The Sisters Brothers’ are also screening.