code: public void setIncludeRoot(File includeroot) {
  
          this.includeroot = includeroot;
  
          if (!includeroot.exists()) {
              throw new BuildException("includeroot doesn't exist: "
                      + includeroot);
          }
          if (!includeroot.isDirectory()) {
              throw new BuildException("includeroot must be a directory: "
                      + includeroot);
          }
      }
docs: Set the directory to use for the include globs. This is required only if
  the includes parameter is set.
  
  @param includeroot
  File giving the root directory for the include globs