I like to keep my Makefiles flexible and multifunctional. One of the tasks I usually add to make command is tar, for example the following instruction does the job:

tar:
    tar -cvf $(PROGNAME).tar $(SRCS) Makefile

My question is: How can CMake be used to generate personalized commands like tar?
I would like to see some code samples.
For the full functionality it would be useful to create project's components and be able to use them as parameters.
(Exempli gratia: archive only header files or some specific library).

Thanks in advance for your answers!