message: Update how-to-build about Git LFS
diff: @@ -22,3 +22,6 @@ The project itself includes the source code of several 3rd-party libraries, whic
  ncurses
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  +Currently, we using `git-lfs` to manage the 3rd-party libraries. You should make sure `git-lfs` have been installed before building the source code.
  +
  +Please see [INSTALLING.md](https://github.com/git-lfs/git-lfs/blob/master/INSTALLING.md) for more details.
  