private static VirtualFile findLibraryDir(Sdk sdk, String dirName, OrderRootType rootType) {
    final VirtualFile[] virtualFiles = sdk.getRootProvider().getFiles(rootType);
    for (VirtualFile virtualFile : virtualFiles) {
      if (virtualFile.isValid() && virtualFile.getPath().contains(dirName)) {
        return virtualFile;
      }
    }
    return null;
  }
private static VirtualFile findLibraryDir(Sdk sdk, String dirName, OrderRootType rootType)