
Source code and glade file can be found in http://www.peteronion.org.uk/GtkClock/
You'll need libgtk-3-dev package installed to compile the code.
If you want to look at the ".glade" GUI definition file you'll need to install glade
If you know how to use cmake I've included a CMakeLists.txt
Otherwise compile with "gcc -Wall -Wextra -o Clock Clock.c $(pkg-config --cflags --libs gtk+-3.0) -export-dynamic"
Enjoy.
PeterO