{ buildApp, nextcloudVersion }:
let
  calendar_3_0_1 = buildApp rec {
    appName = "calendar";
    version = "3.0.1";
    url = "https://github.com/nextcloud-releases/${appName}/releases/download/v${version}/${appName}.tar.gz";
    sha256 = "1rywcac7jk4blhw65n6y2m0p4vx5sj7smczfal91n13ylzyqj5bz";
  };
  versions = {
    "20" = calendar_3_0_1;
    "21" = calendar_3_0_1;
    "22" = calendar_3_0_1;
    "23" = calendar_3_0_1;
  };
in
  versions."${builtins.toString nextcloudVersion}" or (throw "Unsupported version for nextcloud app calendar")