https://github.com/Boruch-Baum/xarclock-hebrew
Medieval Jewish clocks seem to have run anti-clockwise. The only surviving example of such that I’m aware is on Prague’s Jewish town hall (2).
Sometime prior to April 1994, Jaime Garcia Ghirelli modified the xclock program (©1989 X Consortium) to run anti-clockwise, because “If clocks had been invented in Argentina (southern hemisphere), they would run anti-clockwise. Down there a sundial runs the other way around!”. That program (xarclock) is the basis for debian’s package xarclock. However, it only has presentation options for Arabic or Roman numeral face digits.
The version in this repository adds a -hebrew option.
Here’s how I began work on this project:
aa=xarclock
mkdir $aa
cd $aa
apt source $aa
sudo apt build-dep $aa
cd xarclock-1.0
dpkg-buildpackage -b -uc -us
cd -
sudo dpkg -i xarclock_1.0-19_amd64.deb