macos_dependencies_install.md

@@ -24,7 +24,12 @@ _Note: here 49 stands for gcc4.9, any version from gcc4.5 to gcc6 should work_
 
 Optional:
 ```shell
-port install hdf5 +fortran
+sudo port install hdf5 +fortran
+```
+
+Optional but recommended:
+```shell
+sudo port install py27-scipy
 ```
 
 To visualize: