anchor.diff:  
       src = fetchurl {
         url = "https://releases.mattermost.com/${version}/mattermost-${version}-linux-amd64.tar.gz";
  -      sha256 = "lFwSZsAcQuuWTN+4wCe7GDLkhp1ASn5GE7/K5Vppr14=";
  +      sha256 = "dxgoYFgW+KKtfNr+1pr7bA9K79gCXpKebTIWDhneuv0=";
       };
   
       installPhase = ''
  
positive.code:       owner = "mattermost";
        repo = "mattermost-server";
        rev = "v${version}";
        sha256 = "cUeGjKutz6Yeq/cP7nYx0zPJ87GKOQWRyNSERzq/nPw=";
      };
  
      ldflags = [
  
negative.code: , storePathAsBuildHash ? false }:
  
  let
    version = "6.3.2";
  
    goPackagePath = "github.com/mattermost/mattermost-server";
  
  