(fetchpatch {
      name = "slang_1.4.9dbs-8.diff.gz";
      url = "http://archive.debian.org/debian-archive/debian-amd64/pool/main/s/slang/slang_1.4.9dbs-8.diff.gz";
      sha256 = "0xdq14k5ynqfwpmis1rcggs7m4n921i3bs27icbmbhfg5gb2hap2";
    })