White Hunter Black Heart (1990)
White Hunter Black Heart is a 1990 American film, directed by and starring Clint Eastwood as John Wilson, based on the book by Peter Viertel. Viertel also co-wrote the script with James Bridges and Burt Kennedy. The film was based on several Golden Age of Hollywood movie producers. The main character is based on real-life director John Huston; at times, Eastwood can be heard drawing out his vowels, speaking in Huston's distinctive style. George Dzundza's character is based on African Queen producer Sam Spiegel.
More at Wikipedia.