Simple clock with options similar to yad
sclock.c requires libgtk3-dev (3.22.30 and later)
compiles with
gcc sclock.c -o sclock $(pkg-config --cflags --libs gtk+-3.0)
for options see help ./sclock --help
sclockx.c requires libcairo2-dev libx11-dev
compiles with
gcc sclockx.c -o sclockx $(pkg-config --cflags --libs cairo-xlib-xrender x11)