anchor.diff:  
       src = fetchurl {
         url = "https://releases.mattermost.com/${version}/mattermost-${version}-linux-amd64.tar.gz";
  -      sha256 = "PqinkPC7J6Ng1fjTrcAa6ZqiyB2JKkGRdvJ6h2wNS5w=";
  +      sha256 = "lFwSZsAcQuuWTN+4wCe7GDLkhp1ASn5GE7/K5Vppr14=";
       };
   
       installPhase = ''
  
positive.code: , storePathAsBuildHash ? false }:
  
  let
    version = "6.3.0";
  
    goPackagePath = "github.com/mattermost/mattermost-server";
  
  
negative.code:         mattermost/fonts \
          mattermost/templates \
          mattermost/config
  
        # For some reason a bunch of these files are +x...
        find $out -type f -exec chmod -x {} \;
      '';
    };
  
  