{
  pkgs,
  texlab-src ? null,
}:
let
  self =
    {
      example-a = pkgs.callPackage ./example-a { };
      example-b = pkgs.callPackage ./example-b { };
      pyzotero = pkgs.callPackage ./pyzotero { };
      pyzotero-cli = pkgs.callPackage ./pyzotero-cli {
        pyzotero = self.pyzotero;
      };
      khal-export = pkgs.callPackage ./khal-export { };
      org-zotero-export = pkgs.callPackage ./org-zotero-export { };
    }
    // (
      if texlab-src != null then
        {
          texlab = pkgs.callPackage ./texlab {
            inherit texlab-src;
          };
        }
      else
        { }
    );
in
self // { default = self.example-a; }