anchor.diff:  
       src = fetchurl {
         url = "https://releases.mattermost.com/${version}/mattermost-${version}-linux-amd64.tar.gz";
  -      sha256 = "Og9DUGyE4cWYF7EQP/8szIrWM1Ldqnpqc+HW+L7XApo=";
  +      sha256 = "JDsCDZEtbeBTYuzOSwrxFNRKXy+9KXirjaCz6ODP5uw=";
       };
   
       installPhase = ''
  
positive.code: , storePathAsBuildHash ? false }:
  
  let
    version = "6.3.3";
  
    goPackagePath = "github.com/mattermost/mattermost-server";
  
  
negative.code:       owner = "mattermost";
        repo = "mattermost-server";
        rev = "v${version}";
        sha256 = "905zxMucDTxxrLoh5ZoAExW4eFmi+xa98aI3EpJZ2Og=";
      };
  
      ldflags = [
  