There have been several movies based on books or stories by Kurt Vonnegut, including “Slaughterhouse-Five,” “Breakfast of Champions,” and “Mother Night.” Next up — maybe — is a short film based on the Vonnegut short story “Long Walk to Forever.” But producers need money to finish the film, and they’re using the crowdfunding site IndieGoGo to raise it. (They’ve raised $5,000 so far and hope to raise another $5,000 by Nov. 11, Vonnegut’s birthday.) Interest in the celebrated writer is keen around these parts because he lived for a time in Barnstable. Earlier this month, Barnstable’s Sturgis Library, where the author served as a trustee in the 1960s, hosted a three-day event honoring Vonnegut. (He died in 2007 at 84.) To entice prospective contributors, the filmmakers are offering a few interesting perks, including a replica of the Red Rooster lamp the author used, as well as an autographed copy of his novel “Slapstick,” and private screenings of the film when it’s done. Said producer Caitlin Engel: “We’re trying to keep the legacy of Kurt Vonnegut alive for people who didn’t grow up with him.”