@ make an entry like "errorlog: <i>FILENAME</i>" in the
      @ CGI script at %h(P("SCRIPT_FILENAME")).
    }else{
      @ add the "--errorlog <i>FILENAME</i>" option to the
      @ "%h(g.argv[0]) %h(g.zCmdName)" command that launched this server.
    }
  }else{
    FILE *pTest = fossil_fopen(g.zErrlog,"ab");
    if( pTest==0 ){
      @ <li><p>
      @ <b>Error:</b>
      @ There is an error log at "%h(g.zErrlog)" but that file is not
      @ writable and so no logging will occur.
    }else{
      fclose(pTest);

  if( g.zErrlog==0 || fossil_strcmp(g.zErrlog,"-")==0 ){
    no_error_log_available();
    style_finish_page();
    return;
  }
  if( P("truncate1") && cgi_csrf_safe(2) ){
    fclose(fopen(g.zErrlog,"wb"));
  }
  if( P("download") ){
    Blob log;
    blob_read_from_file(&log, g.zErrlog, ExtFILE);
    cgi_set_content_type("text/plain");
    cgi_set_content(&log);
    return;