diff --git a/pkgs/default.nix b/pkgs/default.nix

index 1403670e97a03be965da3401f2eb14b7ef02b8fb..502a2f02863cbc4582186ee7161e0b02d1954ac6 100644

--- a/pkgs/default.nix

+++ b/pkgs/default.nix

@@ -226,7 +226,9 @@ perlSupport = false;

     nlsSupport = false;

   };

 };

• docker-mbtileserver = callPackage ./images/mbtileserver { };

• docker-mbtileserver = if pkgs ? mbtileserver

•  then callPackage ./images/mbtileserver { }
  

•  else null;
  

 docker-quark = callPackage ./images/quark { };

 docker-wekan = callPackage ./images/wekan { };