if( zEnvVar ){
    if( fossil_strcmp(zEnvVar,"none")==0 ){
      if( g.colorOutput==COLOR_VT_UNSET ) g.colorOutput = COLOR_VT_NEVER;
    }else{
      int i, fValid = 1;
      /* Rudimentary sanity check: only allow digits and semicolon. */
      for( i=0; zEnvVar[i]; i++ ){
        if( !strchr("0123456789;",zEnvVar[i]) ){
          fValid = 0;
          break;
        }
      }
      if( fValid ) g.cliColor = mprintf("\033[%sm",zEnvVar);
    }
    fossil_path_free(zEnvVar);
  }
}