1: { callPackage, fetchFromGitHub }: 2: 3: callPackage (fetchFromGitHub { 4: owner = "Warbo"; 5: repo = "run-weka"; 6: rev = "c4033ce"; 7: sha256 = "1zdmzznlrdz6ydsd2bm18bjb1xpiq840dvb6x64m4vhxddl0gg33"; 8: }) {}