Adding controlPort to GNURadio tree

Hello all,

I recently started to work with controlport because I think exploit its
ability for my projetc. I found an example of grc using controlport at

***/gnuradio/gr-blocks/examples/ctrlport

but it couldn’t find the module “ctrlport.monitor” , so I think I didn’t
install controlport when I was trying to install GNURadio.
How I could add controlport to this installed GNURadio?
(may it seems silly question!!! )

Thanks in advance,
Mostafa