code: public void setIncludes(final String includes) {
      if (this.localSet == null) {
        this.localSet = new ConditionalFileSet();
        this.owner.appendExceptFileSet(this.localSet);
      }
      this.localSet.setIncludes(includes);
    }
docs: Comma or space separated list of file patterns that should not be
  compiled using precompiled headers.
  
  @param includes
  the string containing the include patterns