(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;
    })