Problem with rendering tiles with mapnik

Hi all,
I have downloaded the file tunisia.osm and with the osm2pgsql i put the data into a postgres data base.
I have followed the instruction how to change the set-mapnik-dev and i have executed the following commands :

source set-mapnik-env
./customize-mapnik-map >$MAPNIK_MAP_FILE

But the problem is that it seems that the command ./ lead to an** infinite execution.**
I need your help please.

I’ve never used but please tell us in what way it will execute infinitly?