message: add some comment on how to workaround compile error because of gettext not found
diff: @@ -21,6 +21,13 @@ export PYTHON_LIB="~/anaconda/lib/libpython3.6m.dylib"
  ```
  +and in order to fix "fatal error: 'libintl.h' file not found",do the following command,change the gettext version as you want.
  +
  +```bash
  +ln -s /usr/local/Cellar/gettext/0.19.8.1/include/libintl.h /usr/local/include/.
  +ln -s /usr/local/Cellar/gettext/0.19.8.1/lib/libintl.* /usr/local/lib/
  +```
  +
  Also you shall have cython installed. If you don't,install it by the following command:
  ```
  