Since I'm here anyway...
#: cd /mtn/memory/Linux/Packages/
#: tar zxvf pptpd-1.7.1.tar.gz
#: cd pptpd-1.7.1
... those lines are not normally executed as root. Only install is executed as root, and then, only if the install is to a root-only location.
When you report error messages, copy them, along with the command, and paste them here.
Good you saw your problem and
supplied the solution to your post. You did not compound your embarrassment by keeping your lesson secret - now it serves a purpose. Well done.