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The section on security considerations sheds some light on the problems that we can't solve within slock but which the user has to solve in his X configuration.
slock - simple screen locker
============================
simple screen locker utility for X.
Requirements
------------
In order to build slock you need the Xlib header files.
Installation
------------
Edit config.mk to match your local setup (slock is installed into
the /usr/local namespace by default).
Afterwards enter the following command to build and install slock
(if necessary as root):
make clean install
Running slock
-------------
Simply invoke the 'slock' command. To get out of it, enter your password.