I like suckless style Makefiles

https://git.suckless.org/dmenu/file/Makefile.html

https://git.suckless.org/sprop/file/Makefile.html

with file rule variables (my name for them, `OBJ = ${SRC:.c=.o}`).

https://github.com/lpsantil/rt0/blob/master/Makefile

https://github.com/lpsantil/oop0/blob/master/Makefile