The code can be found here: https://codeberg.org/x11cp/x11cp.git
git clone https://codeberg.org/x11cp/x11cp.git && cd x11cp/src/xzoom
To compile this application, the following command should be used:
xmkmf -a && make
There is also a wrapper command in the top-level `Makefile` of the repository where this is can be run as:
xzoom is a magnifier for X11, allowing for portions of windows or the desktop
to be magnified.
Version 0.3 only supported 8-bit colour displays, but version 0.4 onward is maintained, and this supports upto 24-bit displays, and it’s this version which most Linux distributions, and *BSD still ship to this day.