mkdir: Cannot create directory, permission denied

mkdir: Cannot create directory, permission denied

While making and installing a software these problems are coming.. can any
one solve this???
mkdir: cannot create directory `/home/berni': Permission denied
mkdir /home/berni/torcs_bin
mkdir: cannot create directory `/home/berni/torcs_bin': No such file or
directory
mkdir /home/berni/torcs_bin/share
mkdir: cannot create directory `/home/berni/torcs_bin/share': No such file
or directory
mkdir /home/berni/torcs_bin/share/games
mkdir: cannot create directory `/home/berni/torcs_bin/share/games': No
such file or directory